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Towed Vehicle Battery Charge Wire Kit for Demco Supplemental Braking Systems

Towed Vehicle Battery Charge Wire Kit for Demco Supplemental Braking Systems

Item # DM66VR
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Maintain the battery charge on your towed vehicle while it is being flat towed with this charge wire. Works with Demco supplemental braking systems. Call 800-298-1624 to order Demco accessories and parts part number DM66VR or order online at etrailer.com. Free expert support on all Demco products. Guaranteed Lowest Price and Fastest Shipping for Towed Vehicle Battery Charge Wire Kit for Demco Supplemental Braking Systems. Accessories and Parts reviews from real customers.
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Demco Accessories and Parts - DM66VR

  • Tow Bar Braking Systems
  • Charge Line Kit
  • Demco

Maintain the battery charge on your towed vehicle while it is being flat towed with this charge wire. Works with Demco supplemental braking systems.


  • Maintains the battery charge in your towed vehicle while it is being flat towed
  • Works with Demco supplemental braking systems
  • Includes 10-amp in-line diode and fuse
  • Made in the USA

6252 Demco SBS Charge Line Kit

Video of Towed Vehicle Battery Charge Wire Kit for Demco Supplemental Braking Systems

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

Video Transcript for Demco SBS Towed Vehicle Battery Charge Wire Kit Installation - 2020 Ford Ranger

Hey, everybody, Ryan here at etrailer. Today on our 2020 Ford Ranger, we're gonna be taking a look at, and showing you how to install the Demco towed vehicle battery charge wire kit. So the main reason I always recommend using a charge wire kit is so your battery is not drained down whenever you get to your destination. And that happens because nine times out of 10, the vehicle braking system that you're using actually draws power from your vehicle's battery to operate. So every time you apply the brakes and that breaking system activates, it's gonna take a little bit of juice from your battery. So let's say if you don't stop every now and again and start up your car, let that battery charge up, or if you're on a multiple day trip, leave everything hooked up, and you get to your destination, unhook your vehicle, sometimes your battery can be drained and be dead.

And then you gotta go through the trouble of charging it up, getting a jump box, maybe find someone to jump start you, and that's a big headache. No one wants to deal with that when you're trying to enjoy yourself. And by using a charge line it's gonna eliminate that. And that's because whenever you're flat towing, your motorhome is more or less going to maintain or trickle charge your vehicle's battery whenever you're going down the road. That way once you get to your spot you can unhook and have the confidence knowing that your vehicle will start right up.

So the way this kit is going to work is it's going to use your motorhome's 12 volt auxiliary power here at the back of it on the 7-Way. Now, you will have to have a 12 volt power supply for everything to work properly. Pretty much any time I've seen a motorhome with a 7-way on it it's more than likely gonna have that power supply, that 12 volt auxiliary power. Just something I wanted to mention. But whenever you start the motorhome, get going down the road, it's gonna send power from that 7-Way, through your tow bar wiring, and into your connector plug here at the front of your vehicle.

And that's where our charge wires are actually hooked up. So that power is gonna go through the plug, through our charge wire and run up to the positive battery post where it's going to charge everything up. So the kit is designed to charge up your towed vehicle's battery whenever your motorhome is running and you're connected to it. So you're not gonna have to worry about it affecting your motorhome's batteries. It's not gonna drain those batteries down or anything like that.

And that's because it's going to receive that power it needs from your motorhome charging system. That way when it's running your alternator is working charging not only the motorhome batteries, but sending that power back here too to maintain your towed vehicle's battery. Now, I do wanna mention, the kit isn't going to bring a dead battery back to life, or if you have a battery with a bad cell or on its way out, something like that, it's not going to refurbish that battery, so the kit is designed to maintain batteries that are in good working condition. So, there's gonna be five main components that you're gonna need to flat tow your Ranger down the road safely. First one's gonna be your base plate, and that base plate is going to provide us with a solid and reliable connection point, that way we can hook up our tow bar. A tow bar is gonna be that second component, and this is gonna be that physical link that connects the front of your Ranger to the back of your motorhome. The third main component is going to be safety cables, and those are there in the event of an unlikely disconnect, these are gonna keep everything connected to each other. The fourth main component it's going to be tow bar wiring. And is going to transfer the lighting signals from the back of your motorhome to the back of your Ranger, that way it'll keep you safe and legal. And last but not least is a braking system. And what the braking system is going to do is apply the brakes in your Ranger whenever you hit the brakes in your motorhome, and that's going to help bring you to a more predictable stop. And there is just a couple more things I would suggest using in conjunction with those five main components just to make your overall experience that much better. One of them is what's called a brake light relay. And I recommend that because with these Rangers, let's say, if you have on your turn signal, and you hit the brakes at the same time, with the Rangers what's gonna happen is the turn signal flashing on the back of your truck is gonna be overridden by the motorhome's brake signals. So people aren't gonna know kind of what's going on, they're gonna see the brake lights on the Ranger and potentially your turn signal on the motorhome, and things kind of just can get confusing that way. There is one thing that I do wanna mention and that is the use of a high-low adapter. And in our case, we actually don't need it, but it's still something I figured I'd bring up, and the use of a high-low adapter what that's gonna do is make sure that your tow bar is riding nice and level. And so to figure out if you would need that you want the measurement here from the center of your hitch or your pinhole on your base plate to the ground to be within three inches of the measurement here on your motorhome hitch from the pin hole down to the ground. In our case, on our base plate, that's gonna measure about 15 and a half inches, it's kind of just a reference. Keep in mind if your truck has different size tires or lift kit, something like that on it, that measurement could vary. But something that I figured I would throw out. And if you do end up needing a high-low adapter, we have multiple different sizes and so on right here at etrailer. So at the end of the day, a charge line kit is almost a must have for your Ranger whenever you're flat towing it. It's just going to really simplify things. You're not gonna have to worry about that dead battery when you get to your destination, and you can fire up your truck and go have some fun. Now, as far as the installation goes, really not too bad, considering you just have one end of a wire to hook up to the plug, pop the other end on the battery, and you're good to go. So it really shouldn't give you a whole lot of issues or take you a whole lot of time. Speaking of which, let's go ahead and pull into the shop and put it on together now. To begin our installation we're gonna be underneath the hood of our Ranger here, and we're gonna need to hook up our ring terminal to the positive battery terminal. First thing you wanna do is open up your fuse holder, make sure that that fuse is not installed we'll put that in once everything is hooked up. So we open this here. We're gonna have a few different power studs that we can choose from. I'm going to use this one right here because there's nothing connected to it, and it just looks like the ideal spot. So I'm gonna remove that nut using a 10 millimeter. Let's go ahead and pull this off. Then we can take our ring terminal, slide that over the stud, and simply re-install the nut. So now we have that hooked up, we can close up our cover there, and then we can start to route this down to our connector plug at the front of our vehicle. Now, when you do this, you wanna make sure to avoid any hot or moving parts. And I just brought ours around through here. And it just drops down through an opening right here in this area. So here's where our wire comes down and around through here. I wanna point out that in our case we do have the front bumper removed that's because we're installing this the same time that we did our base plate, which I suggest doing 'cause it gives us all such room, but that said you don't have to have the bumper off to get this installed, just makes it easier. That wire's gonna loop around and come on down to where we have our connector plug loosely installed. So what we're gonna need to do is take the rubber boot off of the plug. We're gonna take our wire, run it through that connector plug, and through our bracket, and the pen that we're going to be hooking this up to, is this pen here in the center. And our case, the way our plug works is we will back out that set screw, enter the wires pre-stripped already, that'll simply just feed into that terminal. Make sure it's in there, good. We'll come back and just snug up that set screw. So now that we have the wire hooked up, I will reinstall our cover, and for now I'm just gonna loosely install our plug until we get our bumper back on, and everything else re-installed. Now that everything is set up, we can come back here to our fuse holder take the included fuse and plug that in. And that'll finish up our look at and our installation of the Demco towed vehicle battery charge wire kit on our 2020 Ford Ranger..

Customer Reviews

Towed Vehicle Battery Charge Wire Kit for Demco Supplemental Braking Systems - DM66VR

Average Customer Rating:  5.0 out of 5 stars   (10 Customer Reviews)

Maintain the battery charge on your towed vehicle while it is being flat towed with this charge wire. Works with Demco supplemental braking systems.

- DM66VR

Perfect compliment to our Semco Stay-n-Play Duo. This is the second vehicle I have installed this kit on and they work flawlessly!!

- DM66VR

2013 Jeep Wrangler. Kit had everything i needed and wire was long enough. Easy installation.

- DM66VR

Great customer service

- DM66VR

- DM66VR

- DM66VR

- DM66VR

- DM66VR

- DM66VR

- DM66VR


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Shane H
Test Fit:
Shane H
Employee Ryan G
Test Fit:
Ryan G
Employee Kristina F
Written by:
Kristina F
Employee Noah M
Updated by:
Noah M

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