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Blazer Complete Relay Wiring Kit with Toggle Switch

Blazer Complete Relay Wiring Kit with Toggle Switch

Item # MM510
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MM510 - Relay Wiring Kit Blazer Vehicle Lights
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This wiring kit allows your auxiliary lamps to be controlled by your vehicle's headlight circuit without overloading the circuit and blowing the fuse. Includes an illuminated power switch, 40-amp relay, fuses, and all necessary connectors. 1-800-496-5010 to order Blazer accessories and parts part number MM510 or order online at Free expert support on all Blazer products. Great prices and Fastest Shipping for Blazer Complete Relay Wiring Kit with Toggle Switch. Accessories and Parts reviews from real customers.
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  • Why etrailer?

Blazer Accessories and Parts - MM510

  • Vehicle Lights
  • Relay Wiring Kit
  • Blazer

This wiring kit allows your auxiliary lamps to be controlled by your vehicle's headlight circuit without overloading the circuit and blowing the fuse. Includes an illuminated power switch, 40-amp relay, fuses, and all necessary connectors.


  • Lets you wire auxiliary lights so that they function along with your vehicle lights
    • On/off toggle switch lets you manually turn lights on or off, if needed
  • Keeps your auxiliary lamps from overloading your vehicle's electrical system
    • Power circuit connects directly to battery for power
    • Control circuit draws less than 0.5 amps from the vehicle headlight system
  • Includes 40-amp relay, lighted on/off toggle switch, required fuses, and necessary connectors
  • Designed for any auxiliary device that has a high amp draw


  • Switch rating: 15 amps at 15 VDC
  • 1-Year warranty

MM510 Blazer International Complete Relay Wiring Kit

Video of Blazer Complete Relay Wiring Kit with Toggle Switch

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Blazer Complete Relay Wiring Kit with Toggle Switch Installation - Enclosed Trailer

Hey guys, Kevin here, with etrailer and today I'm gonna be showing you how to install the Blazer complete relay kit here on our enclosed Featherlite trailer. So, our relay kit is going to come with plenty of wires, connectors to get onto our spade terminals here on the actual relay itself. It's also gonna come with a toggle switch, which just for our application today, we did not use just because it doesn't really fit the aesthetics of our trailer and since we already had a metal on off toggle switch, we wanted to kind of keep that look, just to go along with our race trailer. So, this relay kit is going to have a variety of different uses. For our use today, we just wanted to be able to manually power some exterior lights that we had already put on the back of this trailer and wired into our reverse light. That way, if our neighbor needs to pull his race car into his trailer, he doesn't have to worry about hooking up his truck and then powering on the reverse lights just to get his extra brightness off the back.

He can easily just flip the switch and pull his car right into the trailer. As far as installation difficulty goes it's really gonna depend on your setup and just how far you have to run the wiring. On the bottom of your relay, there's going to be four prongs, each coded with a number. Up top is gonna be 87. We are running this wire from 87 down to our junction box, for our seven way, and then tying that in to our reverse lights so that we can power the exterior lights every time that our trailer is in reverse.

To the right of that is 85. We've paired that up with 30 right here which would go to your battery normally. We spliced those together, ran that out and then ran that over to our light switch so that we can also control the power flowing to our light switch to manually turn on our exterior lights. And then on 86, we just had that grounded straight to the wall of our trailer. But with all that done, now we can go ahead and mount our relay back up onto the wall.

So, because I'm installing a relay, I yanked out the original switch that we had right here and I cut into our power 'cause I'm gonna make a little jumper over to our new switch. And then I ran our other power wire coming from our relay right over through our ceiling, down into our railing here. And then we're going to make our connections. Doesn't matter which wire that you use when you're doing this. So, I'm just gonna hook up my left side here to my wire, ran over to our relay.

That in. Then we can crimp it down. And then on my other side, I've already stripped a wire back on each side and I'm gonna make a little jumper from our power wire to our other switch and then place that onto my other wire right over here. So, I'll twist these together. We'll put on our butt connector. Crimp it down. Then we can crimp on our other side of our power wire so that we have a connection back to our first switch. And then we'll use another butt connector between our new switch and our jumper wire. Now we can go ahead and place our wiring back up into our wall here and then put on our plates so we have a nice cover, you don't see these ugly holes in the way. Pull off our on off. Take our cover. Slide that right through. I'm actually gonna have to take this one off as well, just for this switch. Drop that on, drop on our on off. And this is only gonna go one way, 'cause there's a little tooth right there that's gonna go right into this gap. So, you don't have to worry about putting it on the wrong way. And twist on the cap. Back in place. And now I'm just gonna take some self tappers and shoot 'em right through to hold our cover in place. Now that our switch is in place we can test our relay out and make sure that it allows us to manually power our lights. Well guys, I think that about does it for today's installation of the Blazer complete relay kit here on our enclosed Featherlite trailer. Mine name's Kevin. Thanks for watching..

Customer Satisfaction Score:

Customer Reviews

Blazer Complete Relay Wiring Kit with Toggle Switch - MM510

Average Customer Rating:  3.9 out of 5 stars   (8 Customer Reviews)

This wiring kit allows your auxiliary lamps to be controlled by your vehicle's headlight circuit without overloading the circuit and blowing the fuse. Includes an illuminated power switch, 40-amp relay, fuses, and all necessary connectors.


When converting 4 pin to 7 pin, I used this kit as a source for trailer aux (4-pin brown) after other troubleshooting failed. A shop installed my 4 pin controller and it turns out my car doesn't supply a voltage to the quick-clipped lead for brown (and has an empty light bulb holder reserved for another model). Yes the leads in the kit are thin, but so are stock leads pumping 12v.


Material quality not as high as I had hoped. Thank you


Fast shipment, and product fit just wright. Excellent company. will be buying more products in the future from this awesome company.


I ended up NOT using this for my project, the wires appears to be of low quality, surprised since everything else I have purchased from ET I've been VERY pleased with.


Loved the lights and easy hookup,thank you


Product received as advertised.




See what our Experts say about this Blazer Accessories and Parts

  • Can Blazer Complete Relay Wiring Kit be Used on Boat Center Console
    The Blazer Complete Relay Wiring Kit with Toggle Switch # MM510 is a universal type applicate, so if you wanted to you can use it on the center console of your boat. I have added a link below to a video showing the kit being installed, and while it's not on a boat it should give you a good idea of how it works.
    view full answer...
  • Can the MaxxTow Magnetic Tow Lights Be Hardwired Directly to a Tow Vehicle
    The MaxxTow Magnetic Tow Lights part # C6304 are designed to be placed on a towed vehicle and then powered using a four way trailer connector on a tow vehicle. The four way trailer connector on the tow vehicle is then likely ran through an integrated trailer lighting circuit which contains fuses, relays, and power from the battery. If you wanted to wire the MaxxTow Magnetic Tow Lights directly to the towed vehicle then you could use pretty much any standard automotive relay and switch...
    view full answer...
  • Is Using Relay on Blazer MM510 Wiring Kit Necessary to Wire Auxiliary Lamps on Boat
    I would recommend using the relay included with the # MM510 Blazer wiring kit, as it keeps the higher amperage from the supply to the lights from the toggle switch. If you're only running a few lamps like the # TN44RR you'd looked at, it isn't terribly important but since this is being used in a marine environment I'd recommend keeping the higher amperage away from the switch if possible, which is what the relay does for you. I've linked to an install video for the wiring kit.
    view full answer...
  • Can I Wire an Optronics LED Off-Road Light Bar to a 4 Way Connector?
    You could connect the Optronics LED Off-Road Light Bar # UCL23CB to a 4 way connector like the 4-Pole Trailer End Connector # 18004 in order to allow you to receive power when it is plugged into the 4 way connector on your 2019 Jeep Cherokee, but there is no running light circuit on a 4 way connector so you'd likely need to use the tail light circuit in order to accomplish this. With that being said, this really isn't going to be the best way to accomplish this. You would be much better...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Tammy D
Written by:
Tammy D
Employee Alexander C
Updated by:
Alexander C
Employee Daron K
Updated by:
Daron K
Employee David F
Installed by:
David F

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