bing tracking image
  1. Accessories and Parts
  2. Roadmaster
  3. Tow Bar Wiring
  4. Auto Battery Disconnect
Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System

Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System

Item # RM-766
lowest price pledge
Retail:$321.45
Our Price: $199.75
You Save: $121.70
Accessories and Parts
This item qualifies for Free Shipping
Shipping Weight: 3 lbs
Quantity: 
In Stock
Roadmaster Auto Battery Disconnect Accessories and Parts - RM-766
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Conveniently disconnect your battery so that your vehicle can be flat towed per manufacturer instructions. System with switch charges your towed car's battery during towing to prevent dead battery and maintain charge for accessories. Call 800-298-1624 to order Roadmaster accessories and parts part number RM-766 or order online at etrailer.com. Free expert support on all Roadmaster products. Guaranteed Lowest Price and Fastest Shipping for Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (140)
  • Q & A (0)
  • Photos
  • Why etrailer?

Roadmaster Accessories and Parts - RM-766

  • Tow Bar Wiring
  • Auto Battery Disconnect
  • Roadmaster

Conveniently disconnect your battery so that your vehicle can be flat towed per manufacturer instructions. System with switch charges your towed car's battery during towing to prevent dead battery and maintain charge for accessories.


Features:

  • Lets you easily disconnect your battery so that your vehicle can be towed behind your RV
    • Can only be used on vehicle on which battery must be disconnected for towing
    • Includes switch for installing in the towed vehicle
    • Consult your owner's manual
  • Eliminates inconvenience and the potential danger of pulling your battery cable
  • Operates with switch
  • Includes a corrosion-resistant, marine-grade solenoid with 200-amp constant duty and 600-amp surge
  • Works with almost any 12V battery
  • Comes pre-assembled for easy installation


Notes:

  • Disconnecting the battery, whether manually or with the Roadmaster automatic disconnect, will affect your vehicle's electronics. You will need to reset various electrical components in your vehicle following use of this product.
  • Not for use with diesel engine vehicles, due to the high compression ratio of diesels the engine can surge up to 10 times that of a gasoline engine at start up and can cause the solenoid to fail.
  • A charge line, (RM-156-25 - sold separately), is a good idea if you have a braking system that is using power from the towed vehicles battery while it is disconnected.


766 Road Master Automatic Battery Disconnect

Replaces 765

Installation Details RM-766 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System - RM-766

Average Customer Rating:  4.8 out of 5 stars   (140 Customer Reviews)

Conveniently disconnect your battery so that your vehicle can be flat towed per manufacturer instructions. System with switch charges your towed car's battery during towing to prevent dead battery and maintain charge for accessories.

- RM-766
by:

The battery disconnect installation instructions were clear and the installation went well in my 2018 Chevrolet Colorado ... in spite of the kit missing a few pieces like a second star washer for connecting the two battery cables and the second piece of protective tubing. I covered the exposed energized solenoid terminals with electrical tape to prevent an potential inadvertent short in the future when working under the hood. Works as designed so far.


Comments
I towed the Colorado from Maine to Arizona last winter and the battery disconnect worked well for the entire trip. It made preparing the truck for towing and driving very easy!
Mike - 07/01/2020


- RM-766
by:

The RM-766 is a solid piece of hardware and comes with absolutely everything required for the install, right down to the "Tow" and "Drive" stickers for the switch. I use it to disconnect the battery in my 2016 Ford Edge 3.5L AWD, to help make it flat towable behind my RV. It works great and I do not have to open the hood and mess with battery cables while travelling. I like it.


Comments
There have been absolutely zero problems with this switch so far. Works like a charm.
Herbert M - 07/13/2018



- RM-766
by:

I received the Roadmaster remote battery disconnect in a timely manner and had it installed in my 2016 Chevy Colorado by a local RV dealer. I used it for the first time this week and it worked like a charm. I didn't lose any of my preset radio stations or any other data that I know of. Pushing a button on the dash is a lot easier than disconnecting and reconnecting battery cables.


Comments
Still working just fine.
Robert M - 09/09/2017



- RM-766
by:

I have a 2014 Silverado that I wanted to tow with my RV. In order to tow GM calls for the battery to be disconnected. This was the only product that I fond that would do what I wanted. It is slightly over priced in my opinion but it does the job. I have attached it to my aftermarket air box and ran the switch under the hood release. This way I can use the remote to unlock the doors when I am ready to unhook.



- RM-766
by:

The product was as advertised and the delivery was also as promised. The order staff was very helpful and knowledgeable about the product and which model to order. The tech support was also very helpful and seemed to know the product and exactly what steps to take for a successful installation.



- RM-766
by:

Love the ease of battery disconnection with this product. The electronics in my 2021 Silverado seem to hate being without power though, and the remote keyless entry is a little finicky for a few cycles after power is restored, by that’s a Chevrolet issue.



- RM-766
by:

LOVE IT!! Most of my other friends do not have the disconnect on their vehicles and have to deal with dead batteries and running their tow vehicle engines every couple of hours.



- RM-766
by:

making towing and keeping battery up, what could be better?



- RM-766
by:

Everything works amazing Thanks to all at etrailer



- RM-766
by:

Would not respond to a phone call or answer a simple question. No more business with etrailer for me.



- RM-766
by:

I gave each and every one of the items I purchased a 5star rating because they each have contributed greatly to my confidence and sense of security about full-time RVing in my Class C rv towing my little car behind. Each product has been well made and thought out and the service from etrailer has been great....from price to shipping and packaging. I couldn't be more pleased with everything. Job well done. Thank you.



- RM-766
by:

i've been towing my gmc canyon for the past year .we have gone to ky., mn.,fl.,and mo. with no problems. the towing package i bought was and easy install and took just a few hours by following the instructions. it was money well spent.


Comments
great!
lupe v - 04/04/2021


- RM-766
by:

Haven’t put it on yet, showed up on time and in good condition, have your e mail and phone no. So will communicate when it is installed tks



- RM-766
by:

I bought this product because to tow my GMC Canyon I have to disconnect the battery and I didn't want to have to get under the hood every time I hooked up and unhooked the vehicle. This product was easy to install, especially with the on-line video. The only mishap I had was the video said to use a 1/4" drill bit to drill pilot holes for the two sheet metal screws that mount the solenoid onto the inside fender. This makes the holes the same diameter as the screw threads and they won't bite. I had to re-drill new holes with a slightly smaller drill bit. The kit did include two 1/4" nuts and bolts to use instead if you access with your fingers to the backside for placement of the nut. I could use the forward hole for the nut/bolt but the rear hole I had to use the sheetmetal screw as it is a double panel. I wasn't comfortable with the two positive terminals on the solenoid being in a location, where when working in the engine compartment, tools can accidentally touch the positive terminal and the solenoid housing and create a spark. I fashioned a piece of inner tube cut in a rectangle and mounting it above the solenoid onto the sidewall, cut a hole for the top plastic cone to stick thru and it now lays over the solenoid covering the terminals enough where accidental contact is minimized.



- RM-766
by:

The instructions were good and they were detailed. The product works as advertised. The button is made so it would be difficult for it to be pushed accidently in most places where it might be installed. The greatest difficulty for me was getting nuts on the mounting bolts for the solenoid. Also, my 2014 Jeep Wrangler had three wires attached to the positive battery post so it was not that straight forward attaching all three to the battery cable. A larger diameter piece of shrink wrap would have helped in this case.



- RM-766
by:

Installation and function have been without issue.



- RM-766
by:

It was easy to install.



- RM-766
by:

Great company. Always responsive to the customer's needs. Had a needed part sent overnight. Arrived ib 16vhours after order was placed. Allowed for us to begin our journey as fulltime RVers as scheduled.



- RM-766
by:

This product is much improved over the video that I watched prior to ordering the product. It does not require 3 wires, but 2 wires. The wires are already connected to the solenoid so there is no need to strip wires and clamp on connectors. The switch is a simple push on-off so no stickers are needed to be placed inside the car. Overall it was very simple to install and works great. Only draw back was getting the 2 wires through the firewall. The video showing how to accomplish that task could have been significantly better. 5 second mention of rubber grommet was not enough to help accomplish this task. Bottomline. GREAT product.



- RM-766
by:

Received on time and in good condition.



- RM-766
by:

Wow!!! So very impressed with this company!!’ Haley helped me by phone make sure everything I ordered was right for my RV and Smartcar (tow bar, base plate, battery shutoff and wiring). It came quick and the quality of the products (Blue Ox) are outstanding. Highly recommend this company!! Thank you for helping me!!



- RM-766
by:

Easy to install. My wife gets our tow vehicle ready to roll. She would not disconnect the battery cable. Now all it takes is a flip of the switch! Happy with this battery disconnect product.


Comments
Our battery disconnect works perfectly every time. Makes preparation for towing much easier
Mike H - 08/24/2018



- RM-766
by:

Works great! Easy to install.



- RM-766
by:

Not installed yet. Have inventoried package and all items appear to be there.



- RM-766
by:

This thing works PERFECT. thanks for the fast shipping as well A+ job guys!


Comments
Still working like a dream, zero problems one year later, thats for a great product
Rick V - 06/16/2021

31
146
Show More Reviews

Ask the Experts about this Roadmaster Accessories and Parts





< Previous
123. . .26



Do you have a question about this Accessories and Part?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality accessories and parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate accessories and part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Laura H
Written by:
Laura H
Employee Randy B
Test Fit:
Randy B
Employee Andrew S
Test Fit:
Andrew S
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Clayton O
Test Fit:
Clayton O
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y
Employee Michael B
Video by:
Michael B
Employee Jacob H
Video by:
Jacob H
Employee Aidan B
Video by:
Aidan B
Employee Thomas T
Video by:
Thomas T

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.