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Kit allows up to 15 amps from your RV's battery to be used to maintain the charge of your towed car's battery while the car is being towed. Charge line connects to the 6-way or 7-way plug on your vehicle. Requires separate charge line in RV.
Features:
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hello, everybody. Clayton here at etrailer.com. Here at etrailer, we install, test, and review a ton of different products to help you, as a customer, make a more educated decision before your purchase. Today we're going to be working on a 2020 Ford Expedition. We're going to be taking a look at and I'll be walking you through how to install the Roadmaster Vehicle Charge Line Kit. So you might be asking yourself, "What, what is the need for a charge line kit or why do I have to have this" And a simple reason is is that our vehicle has to have the ignition keyed on.
So that's going to draw power. And let's say we're doing a six hour trip or even longer, that's just going to draw a lot of power because it's like having your car on without the engine charging the battery. So getting our 12 volt power from our seven-way, that's going to run through our diode wiring and actually up to our battery to charge it. That way whenever we get to our spot, we can just unhook, simply start up our vehicle, and go to the grocery store. And get anything that we need to pick up.
It's definitely going to be a nice peace of mind because you're going to know every time that you get out of your vehicle or into your vehicle, that your battery is going to be charged or charging. Now, one thing I really do like about this kit is everything's going to be included with it, including the circuit breaker. So you're not going to have to hunt down any extra parts. Simply take it out of the box and slap it on. And one cool feature is none of the charge line kit is actually visible.
It's all behind our fascia and attached to our battery. So that's one other thing you're not going to see. And in terms of installation, getting our charge line kit installed, really isn't too bad at all. We just have to run a wire from our plug up to our battery and into our circuit breaker. That being said, let's head in the shop and I'll walk you through how to get it installed.
We have our red wire. We're going to slide that into the center of pool from our six pool. We can tighten that down. Now, we're going to add the rest of our wires and finish wiring it up. Now we'll run our charge line from our plug, over along our body, and route it up to our battery. With our wire ran up we now want to find a good spot to mount our circuit breaker. This is the best spot I could find. It's pretty close to the battery and it's going to be out of the way. We're going to use our two provided self-tapping screws to get that mounted in. Now, we want to take our power wire from our 12 volt. We're going to be putting that to the gold post or copper post on our circuit breaker. We're going to measure that out and cut that excess. Strip it back. And we can add one of our smaller ring terminals. And we'll take our nut off of the circuit breaker and slide that ring terminal on. Reinstall our nut. You don't want to over-tighten this. Just right there will be good. Now we're going to add a small ring terminal to some access wire. With that snug we can run our wire over to our positive terminal. Kind of measure that off. I'm going to cut it right about there. Strip back that end, add our large ring terminal, and crimp it down. We can then grab a 10 millimeter socket. Remove the bolt off of our battery. Gonna slide that ring terminal over the post. Reinstall our nut. With that tight we can come back and zip tie all of our extra wire. That's going to do it for our look at and our installation of Roadmaster's a Vehicle Charge Line Kit on our 2020 Ford Expedition..
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Jeffrey
11/19/2022
I have no regrets with this purchase. Items preform as advertised with no issues. I am very satisfied with Roadmaster and Demco products.
Ken
2/27/2026
Great little product. Worked great while we needed it flat towing and the brake controller and lights were being activated. Now the Jeep is babied , trailered and enclosed.
Gwendolyn Y.
2/27/2026
Victoria H.
1/9/2025
That's awesome Ron! I will let them know you reached out.
Ron
12/20/2025
The Roadmaster accessories work great - the brake switch in the car is ideal for turning it on and off as required.
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Condition: Like New
Notes: May have damaged packaging or minor cosmetic blemishes.
Info for this part was:
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Roy
7/30/2018
Still very happy with our purchase. We’ve towed over 10k miles and have had zero issues with our tow setup. I’ve shared my experience with several other RVrs and recommended your company for their needs. Thank you,