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Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses

Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses

Item # RM76512
Our Price: $99.39
You Save: 21%
Tow Bar Wiring
Shipping Weight: 0.25 lbs
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Take some of the hassle out of towing your car with this fuse bypass system. FuseMaster replaces your vehicle's mini-fuses and lets you prep for towing by simply flipping a switch. Integrated holder keeps fuses secure and functional. Great Prices for the best tow bar wiring from Roadmaster. Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses part number RM76512 can be ordered online at or call 1-800-940-8924 for expert service.
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Roadmaster Tow Bar Wiring - RM76512

  • Fuse Bypass
  • Bypasses Vehicle Wiring
  • Engine Compartment
  • Custom
  • Roadmaster
  • Mini Fuse

Take some of the hassle out of towing your car with this fuse bypass system. FuseMaster replaces your vehicle's mini-fuses and lets you prep for towing by simply flipping a switch. Integrated holder keeps fuses secure and functional.


  • Bypasses towed car's mini-fuses so you can tow your vehicle without draining its battery
    • Provides a simple alternative to removing fuses every time you tow
    • Stores fuses so that you won't lose them
  • Installs quickly, easily and permanently
    • Remove fuses from car's fuse box and install FuseMaster in their place
    • Put fuses into FuseMaster fuse holders
    • Mount bypass switch near fuse box
  • Maintains functionality of mini-fuses when switched on
    • Flip switch to "Drive" position and drive like normal
  • Overrides mini-fuses when switched off
    • Flip switch to "Tow" position and you're good to tow
  • Made in the USA


  • Application: 2 ATM mini-fuses not exceeding 20 amps each
  • Harness length: 13"

Some cars can be towed only if you get under the hood and pull a fuse or fuses. If you don't remove these fuses before towing, there's a good chance that your battery will be drained by the time you reach your destination.

Roadmaster's FuseMaster makes it easy to prep your vehicle for towing. Simply remove the fuses indicated in your owner's manual and replace them with the bypass. The system will hold the removed fuses and maintain their functionality. So, once the initial installation is complete, you don't have to remove or replace your fuses again.

Whenever you want to drive your car, just make sure the switch on the bypass is flipped into the "Drive" position. When the bypass system is on, the fuses will be active and your vehicle will function normally. Then, when it comes time to tow, switch the FuseMaster to "Tow." Doing this will render the fuses inactive so that you can flat tow your car without its battery being drained.


The preferred location for mounting the FuseMaster switch is the access panel inside your vehicle that leads to your fuse box. The switch must be mounted on a plastic surface that is no thicker than 1/4". Do not mount the switch on a metal surface. Drilling is required.

Roadmaster FuseMaster Switch

Included with the FuseMaster are 2 stickers: "Drive" and "Tow." Once the switch is installed, you can place the stickers on the access panel - one on each side of the toggle - to remind you which way the switch must go for each application. Place the "Drive" sticker on the side of the toggle that has the white dot. (To drive your car, the switch must be flipped so that the side with the white dot is depressed.) The "Tow" sticker can then be placed on the opposite side.

76512 Road Master Fuse Master Fuse Bypass for Towed Cars - 2 Fuses - Long

Installation Details RM76512 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses - RM76512

Average Customer Rating:  4.7 out of 5 stars   (301 Customer Reviews)

Take some of the hassle out of towing your car with this fuse bypass system. FuseMaster replaces your vehicle's mini-fuses and lets you prep for towing by simply flipping a switch. Integrated holder keeps fuses secure and functional.


Works great so far, haven't towed the car but put the switch in tow mode and it worked as it should. put in drive mode and car started right up. The installation process is easy enough but there isn't much room around the fuse box to run additional wires.


wiring harness was vey good


etrailer installed a complete Roadmaster RV towing system on my 2019 Chevrolet Sonic RT. Installation was very professionally done and have since towed the Sonic behind my Fleetwood Excursion about 5000 miles with no issues. My Sonic has a passive door looking feature (fob) which requires a Roadmaster on/off switch kit to eliminate having to pull fuses. The kit has two switches which are mounted on the dash and labeled Drive or Tow. On this model Sonic it is important that the switches are turned on/off in the right sequence as not to affect other computer controlled systems. The passive system was new in 2019 and with the help of etrailer and Roadmaster we were able to determine the sequence. I printed the sequence on a card that I keep in the glove box.


Very handy, installation on buick envision required shortening protective sheath due to tight space around fuse block.


Receive the correct wiring harness after I informed etrailer that I had ordered the wrong part. Customer service is great. Will use them in the future

Norman K.


No longer RVing. The wiring harness is too short. It needs to be about 2 inches longer


Not Happy this 78512 part number. It cost 85 dollars and even though Road Master could have furnished necessary fuses they did not. The 76511 kit comes with a fuse adapter which makes the installation easier and safer. After calling Road Master technical support directly and asking for the fuse adapters like provided for in the 76511 kit for the 78512 the tech stated the adapter was only used on CRV models. This was not true the installation video clearly shows these adapters were show to be installed on a Honda Fit 78511 part number install. I think these switch harnesses are wildly overpriced and dangerous the way the way they show installing them with installations that deal with low profile mini fuses. I have lost all faith in Road Master products. I think Road Master's tech support needs some retraining. I think etrailer should no longer handle these products. Still waiting for a return call from Road Master about purchasing the adapters as a separate item.


This is a great concept to solve this fuse pulling issue however I found the leads too short to work with properly. Combined with the fact that the leads where not the same length and that the connectors are almost impossible to install individually into the fuse panel I had to do some re-enginnering. It wasn't too hard to fix really. I simply purchased some ATM fuse jumpers and plugged your connector into it while out on the bench, then when I went to install it into the car I had a solid one piece connector to push into my cars fuse panel. For some who have easier access to the fuse panel these connectors might work fine for for any kind of tight location a single point fuse connection would be a big improvement.


The fuse bypass switch should be maybe $xx MAX - since it’s just a switch, some wire, a fuse socket and bits and pieces.I bought them figuring I should rely on Roadmaster expertise on manufacturing something that is better than what I could put together, but now that I’ve installed all the items, I think I could have just bought the parts and assembled them to work better than these items. The only issue I had with one item was that on the fuse bypass, the little metal prongs at the end of the two wires that you are supposed to plug into the fuse panel should have been a single two prong plug - the same size as a mini or micro fuse, because as single wires and prongs, there’s no way they’d stay plugged into the fuse block securely. I had to buy a couple of fuse “extender cables” and wire them up to the fuse bypass wires to make those work like a standard 2 prong mini or micro fuse works - they plug in as a single unit with two prongs.
Both of these issues - cost and single prong ends on the fuse bypass - I’ve seen mentioned in other reviews of these products, so I know etrailer is aware of your other customers complaints on these items. But what will anything be done about them? I doubt it.


This is not user friendly! I had to make an
Adapter to hold the small knife blades in the fuse holder in the fuse panel on my 2012 Honda CRV , also , with bypass switch in tow ,lights are still on the dash ?


The only thing that could make this product better and easier to install would be for it to include a fuse-style plug for the wiring into the fuse box. ETrailer has done everything they can to clearly show what is involved with the installation, so I wasn't surprised, but Roadmaster could make the installation easier with just a little extra.


The order was shipped immediately and I received it within just a few days. The video on the website was very very helpful. I was able to install everything myself in just a few minutes, except I couldn't get the wires to connect in the fuse holder. I had to take it to a mechanic, and he trimmed back the insulation so the ends were long enough to be able to slide into the fuse box. Also I had trouble reaching one of the fuse connections in the fuse box. This was no fault of the product. Just my 70 year old body would bend in the right places so I could reach it, and my 70 year old eyes had trouble seeing up close. I haven't towed the car yet, but apparently everything is working as it should.


The lock has started to rust and is hard to unlock with the key even though I have kept the rubber keyhole cover in place to protect it.


excellent products that i had purchased from etrailer. i like the ease of operating the tow products and especially the great job that etrailer did in installing the tow products from the motorhome and to the tow vehicle . etrailer was very professional in everything that they did.


I had a mechanic put this on my 2014 Honda CRV. Works great not one problem after one year and 5000 mikes.


Perfect. Great installation video. Works as advertised.


Fairly easy to install and works as intended clear instructions really helped. Installed on 2019 Buick Envision


Good instructions, the leads could have been longer, if there's a choice, get the kit with longer leads.


The directions were clear and applied to my specific vehicle. Successfully installed in a reasonable time. Happily traveled many miles without grief.
Thank you


Exactly what was ordered with prompt de livery.


Easy for one person to install. Quality product


It is exactly what I ordered. Installed easily and works great


Works as advertised but a little difficult to install.




Works as advertised - no issues!


Third Order from here. Always above average. Two arrived a day early. Sales staff was above being polite. Oh and yes I will be back.

Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • Why do Fuses Need to be Pulled on 2018 Chevy Malibu When Flat Towing
    We have the same information you have, which comes from the owner's manual. On page 353 of the owner's manual for a 2018 Chevy Malibu it states, as you said, "To prevent the battery from draining while the vehicle is being towed, remove fuses F10 and F41 from the instrument panel fuse block." We do have to go by what the manufacturer says and therefore cannot recommend you flat tow this vehicle without pulling the fuses. You will want to use the Roadmaster FuseMaster Fuse Bypass Switch...
    view full answer...
  • Unlocking Steering Wheel of 2019 Buick Envision to Flat Tow it
    So another thing you might try is putting the vehicle in neutral like you mentioned and then with the engine off pressing the start engine button with your foot off of the brake. That is normally what it takes to unlock the steering wheel of a car with a push button start. It should put it into ACC mode which will then unlock the wheel.
    view full answer...
  • Recommended FuseMaster Switch for Fuses of 2012 Chevy Cruze when Flat Towed
    For your 2012 Chevy Cruze the recommended fuse bypass switch is the Fusemaster part # RM76512 your ATM mini fuses.
    view full answer...
  • Battery Draining When Flat Towing a 2014 Ford Explorer Behind a Motor Home
    There isn't a fuse bypass that is confirmed to fit your 2014 Ford Explorer. The owners manual does state that having the vehicle in the accessory mode can drain the battery. It mentions that you will need to start and allow the vehicle to run for 5 minutes at the start of the day and at 6 hour intervals. This should allow the alternator to charge the battery. You may find that you will need to do this more frequently than every 6 hours if you continue to have issues.
    view full answer...
  • Availability of 4-Pin Roadmaster FuseMaster Fuse Bypass
    We have the Roadmaster FuseMaster Fuse Bypass # RM76512 that uses 4 pins like you are wanting as it shuts off two circuits. I attached an install video for this on a 2019 Chevy Sonic for you to check out as well.
    view full answer...
  • Which Roadmaster Fuse Bypass is Recommended for 2014 Honda CR-V
    For the 2014 Honda CR-V we have found that you will want the part # RM76512 which allows you the easy ability to kill two circuits. We have found that circuits 19 and 20, ACC radio fuse and ACC key lock, on your vehicle need to be killed when flat towing and that's why you need the # RM76512.
    view full answer...
  • Fuse Bypass Switch Recommendation for 2018 Chevy Sonic being Flat Towed
    Yes, we have the Roadmaster FuseMaster # RM76512 which is a confirmed fit for your 2018 Chevy Sonic and basically plugs into your fuse box and allows you to kill the two circuits you need to deactivate in your 2018 Chevy Sonic with just a switch. I attached an install video that shows this kit installed on a 2018 Chevy Sonic just like yours.
    view full answer...
  • Which Fuses Need Pulled On a 2012 Honda CR-V Before Being Towed
    I took a look in the owner's manual for a 2012 Honda CR-V and it states that if you will be towing for more than 8 hours in a day you will need to remove the 7.5 amp accessory radio fuse and 7.5 amp accessory key lock fuse. These fuses should both be labeled with the prefix "ACC". If you need help locating them there is a chart on page 256 of the owner's manual. The Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle part # RM76512 will be needed to pull the fuses.
    view full answer...
  • Troubleshooting Installation of Roadmaster FuseMaster Bypass On 2019 Buick Envision
    The Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses # RM76512 does not seem to be operating correctly. The manufacturer suggests to confirm the following when it fails to operate correctly: • …the pins are fully seated in the fuse socket and not touching each other; • …the wiring is properly connected to the back of the switch; and • …there is a properly-installed fuse in the FuseMaster harness and that it is not blown. Double check the installation...
    view full answer...
  • Battery Drains While Flat Towing 2011 Ford Edge
    Your 2011 Ford Edge requires the key to be in the accessory position while towing. The accessory position allows the electrical accessories such as the radio to operate while the engine is not running. These electrical accessories could be draining your vehicle while towing. To prevent these accessories from draining your battery, you can pull the fuses for accessories activated while in the accessory position, or you can install a fuse bypass like the Roadmaster FuseMaster Fuse Bypass...
    view full answer...
  • Do Fuses of Honda CR-V Need to Still be Pulled When Flat Towing if Battery Charger is Used
    Yes, even with the battery charger installed when you are flat-towing your 2012 Honda CR-V you would still want the fuses removed. The charger will help keep the battery in good shape but the with the fuses left installed the battery would still end up depleted. The battery charger would just basically slow down the process slightly but it would not totally be able to keep up.
    view full answer...
  • Why Is There A Dinging Noise Even After Pulling Fuses To Flat Tow A 2020 Buick Envision
    Removing the two fuses is to prevent battery drain and wouldn't necessarily stop a dinging noise. If the vehicle is still making a dinging noise after the fuses are pulled then they aren't what is powering the noise. There are multiple fuse blocks within the Envision so you'll first want to make sure you're pulling fuse 29 and 32 from the glove box fuse block and not from the engine compartment fuse block. These fuses are for the body control module 1 & 2, and I've attached a diagram below...
    view full answer...
    Image 1 for
  • Do Fuses of 2015 Chevy Malibu Need to be Pulled When Flat Towing It
    When flat towing a vehicle we have to recommend you stick with all of the requirements that are listed in the owners manual. Just putting your vehicle in neutral would not be enough as you'd need to remove all of the recommended fuses. The number 8, 22 and 24 fuse would need to be pulled. Using the Roadmaster # RM76511 and # RM76512 would allow you to easily and quickly bypass all three fuses with just the flick of a switch. These bypasses are compatible with the ATM mini fuses used by...
    view full answer...
  • Why Do Fuses Need to Be Removed When Flat Towing 2011 Cadillac SRX
    The fuses that are required to be removed for flat towing a 2011 Cadillac SRX (BCM1, BCM2 and BCM3) all correspond to components that will drain the battery during flat towing with the way that the vehicle is configured. If you don't remove those fuses, in most cases (tows over 50 miles) the components draw enough power from the battery in that time period that your battery will be dead by the time you reach your destination. This is simply done as a precaution to avoid draining your toad's...
    view full answer...
  • Roadmaster InvisiBrake Supplemental Braking System Compatibility With A 2020 Buick Envision
    I spoke with the manufacturer to verify any issues with the compatibility if your 2020 Buick Envision and the Roadmaster InvisiBrake Supplemental Braking System Item # RM-8700 and confirmed that you will have no issues linking into the vacuum system with the tee and installing the check valve. I have attached an installation video to help you as well. When flat towing your vehicle you'll also need to remove fuse 29 & 32. You can install the Roadmaster FuseMaster Fuse Bypass Switch for...
    view full answer...
  • Roadmaster Fuse Bypass Recommendation for 2014 Honda CR-V
    If your 2014 Honda CR-V owner's manual says to only pull the #19 ACC radio fuse, use part # RM76511; if it states to pull the #19 ACC radio fuse and the #20 ACC key lock fuse, use part # RM76512. Both are a fit for your vehicle.
    view full answer...
  • What Is The Process For Prepping a 2020 Buick Envision To Be Flat Towed?
    According to the owners manual for the 2020 Buick Envision you will have a similar process. First you will secure your Envision to the motorhome, then turn on the ignition and switch to neutral. With the transmission in neutral you will turn off the ignition and then there are 2 fuses in the instrument control panel that will need pulled to prevent draining the battery. Or you can install the Roadmaster FuseMaster Fuse Bypass Switch # RM76512 to simply switch off the fuses when you are...
    view full answer...
  • Dinghy Tow Preparation for 2014 Chevrolet Malibu
    I took a look at the Recreational Towing section of your 2014 Chevrolet Malibu owner's manual. As you mentioned, you will remove fuse 8, 22 and 24 from the instrument panel fuse block. This is done to prevent the battery from draining while the vehicle is being towed. The manual does not state that it is required to run the vehicle's engine at any particular interval during trips, however if you are concerned about the battery draining, you can do this to occasionally provide it some charge. I...
    view full answer...
  • Is Roadmaster RM-88400 Brake-Lite Relay Kit Needed to Flat Tow 2019 Buick Envision
    The 2019 Buick Envision use a combined taillight system which uses the same dual-intensity bulb for both the turn signals and the brake lamps. Because of that, the Roadmaster # RM-88400 brake light relay is NOT needed. To prevent the battery from being drained while towing the vehicle, you'll need to remove the fuses in position F29 and F32 from the fuse block located in the glove compartment while towing, and replace them to drive the vehicle normally. A fuse bypass switch, # RM76512...
    view full answer...
  • Fuse Bypass For 2014 Honda CRV Flat Tow
    Short answer is yes. You will need to check your owners manual to verify if you need to remove one fuse of two. It just depends on how they set that version up. If you need to bypass one use the Roadmaster FuseMaster Fuse Bypass - 13" - 20-Amp Mini-Fuse # RM76511. If you need to bypass two use the Roadmaster FuseMaster Fuse Bypass Switch for Towed Vehicle - (2) 20-Amp ATM Mini-Fuses # RM76512.
    view full answer...
  • What Fuse Gets Pulled to Flat Tow a 2013 Honda CR-V
    When flat towing your 2013 Honda CR-V you will need to pull the ACC fuse located in position 19 if you plan on towing more than 8 hours. Your owners manual will have more info on that. Or you can use a Roadmaster FuseMaster part # RM76512. You will remove the ACC fuse, install this in it's place and then when you flat tow your vehicle you would just need to flip the switch instead of pulling the fuse. I attached an FAQ article on flat towing for you to check out as well.
    view full answer...
  • What Two Fuses Need to Get Pulled to Flat Tow 2014 Honda CR-V
    When it comes to the procedure for a specific vehicle for flat towing you have to go with what the manufacturer recommends. Either by what's in the owners manual or by contacting the manufacturer of the vehicle. Based on what you listed you would need to leave the ignition in ACC mode and the two fuses you mentioned of 19 and 20. We actually had the chance to install the # RM76512 on a 2014 Honda CR-V just like yours and I attached an install video that shows which fuses had to be bypassed.
    view full answer...
  • Will 2-Fuse Bypass Still Operate for Single-Fuse Application
    Thank you for your recent purchase from If you purchased a 2-fuse bypass and only need a single you can certainly still use this item in your application. The bypass will still function to override the mini fuse when switched to the Tow position. Please refer to the linked installation instructions.
    view full answer...
  • Is the Fuse Bypass Still Needed On a 2012 Honda CR-V If Battery Charge Line Is Installed
    The Roadmaster FuseMaster Fuse Bypass Switch part # RM76512 is indeed needed for a 2012 Honda CR-V regardless of whether or not a battery charge line like the Roadmaster Battery Charge Line Kit for Towed Vehicles part # RM-156-25 is used. The purpose of the fuse bypass is indeed to stop certain accessories from drawing power and draining the battery but that is not all, there are other purposes such as de-activating circuits which could cause damage to the vehicle if powered on while in tow mode
    view full answer...

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