How To Charge Towed Vehicles Battery With Tow Vehicles 7 Way Connector
Updated 05/19/2021 | Published 05/17/2021
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Question:
Can I use this connector to plug into my 7 to 4 pin trailer adapter to charge the vehicle main battery?
asked by: Steven S
Expert Reply:
The 2-Wire Trailer Adapter for Go Power Portable Solar Kits # GP72VR is specifically for Go Power solar panels so if you don't have one of those then I don't recommend using this.
It sounds to me like you are wanting to use your vehicle's 7 way trailer connector to charge your towed vehicle's battery. If your 7 way already has a pin that has 12v when the vehicle is running then you can simply use that circuit (usually it is the 1 o'clock pin on 7 way). If you don't already have a 12v pin then you first need to run Roadmaster Battery Charge Line Kit # RM-156-75 from the tow vehicle's battery to the 7 way.
Now that your 7 way has 12v power, you can run the 12v wire to the towed vehicle to charge the battery. There are several ways to do this, but I think the best way is to cut off the 4 way connector on your trailer wiring and install Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End # PK12706. Then you can use 10 Gauge Primary Wire - Blue # 10-1-1 (sold per foot) to run from the 7 way connector to your vehicle's battery.
I attached demonstration videos along with a couple wiring diagrams for you to check out.
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