Installing a Trailer Battery Charge Line from Vehicle Trailer Connector

Question

Question:

charging battery on popup Hi - this answer was given by Reno H concerning charging the battery on a pop up: To maintain power to the battery, you would need to run a wire from the positive terminal on the trailer battery to the power wire on the 7-way. I would recommend using 10 gauge wire, part # 10-1-1, and connecting to the Black wire on the trailer 7-way, or the pin in the 11 oclock position when looking at the front of the connector to the positive battery terminal see FAQ. You would then connect the negative terminal to a clean metal surface on the trailer frame for a ground connection so does that charge the battery when hooked to the vehicle ?

asked by: Don L

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Expert Reply:

To charge your trailer battery when you look at the 7-way trailer-side connector the 11 o'clock pin will mate up to your 12V signal from your vehicle. With most trailer connectors like # H20043 this will be the black wire. That black wire simply connects using 10 gauge butt connector like # DW05745-5 to 10 gauge wire sold by the foot # 10-1-1 which will connect to your trailer battery positive terminal. As you stated the negative terminal of the trailer battery will be connected to the metal frame with a bare metal to metal connection for a ground. If you do not have the 12V power on your vehicle side, you can use the # 30717 and connect the white wire to ground and then the black wire to # 10-1-1 run up to your engine compartment. Before connecting to the positive battery terminal, you will need to add a circuit breaker # 9510.

This will allow your trailer battery to receive a maintenance charge while connected to your vehicle. This is a very slight charge depending on your vehicle alternator of between 2 and 4 amps at 12V. This will not charge a dead battery, but will slowly charge and maintain your trailer battery.

If you want to really charge a depleted battery, you will need a different setup like the DC to DC charger # 331-BCDC1225D which will give you up to 25 amps at 12V to charge a depleted battery.

expert reply by: Jason S

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Answer 1

I couldn't recommend the use of the #RM-077-8 with your 12 inch extender as that would be way too long, but it's possible that this by itself would work for you. You'd end up with an extension of 10-3/4 inches instead of the 12 you have…

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Answer 2

The measurement for the blue section that you drew on the Roadmaster Dual Hitch Receiver #RM-077-8 is 6-1/2".

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Answer 3

The 12 volt outlet on the Hopkins Multi-Tow Trailer Connector Adapter, #HM47675, can be used to maintain a trailer battery but it will not be able to charge it. The gauge wire used to provide power to the 7-Way is too small to effectively charge a…

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Answer 4

The auxiliary 12-volt wire that runs from the 7-way connection to 7-way trailer plug will supply 12-volt power from the vehicle to the trailer. The 12 -volt power will allow interior or exterior lights to run that are not wired in to the…

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Answer 5

You can put a maintenance charge on your trailer battery with the 12 volt accessory circuit of the 7-way. The 1:00 position of your 7-way carries this circuit. You would just need to run a length of 10 gauge wire like part #10-1-1 (sold by the foot),…

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Answer 6

Sounds like you would be interested in the Hopkins Trailer Connector part #HM47675. This will plug into a 7-way and will provide you with a cigarette lighter 12 volt outlet. I attached a review video for this product for you to check out as well.

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Answer 7

No, you should not have to have the trailer plugged into the 7-Way connector on your truck for the winch to work. Assuming the battery is adequately sized for the power draw of the winch then the winch would only need to be connected to that battery…

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Answer 8

In order to charge the battery on a 2022 Chevrolet Equinox while in tow you'll need to run a battery charge line, the Roadmaster Battery Charge Line Kit for Towed Vehicles part #RM-156-25. This takes power from the motorhome battery to charge the…

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Answer 9

In order to bypass the factory trailer lighting circuits on a 2005 Dodge Ram 3500 you'll first need to start with the Curt T-Connector Vehicle Wiring Harness part #C55504. This can then be adapted to a 7-way using the 4 to 7-Way with 4-Way…

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Answer 10

The wire that runs from the vehicle's battery to the 7-way trailer connector and then from the 7-way trailer connector to the trailer battery should be at least a 10 gauge. If you don't have any 10 gauge wire you can purchase part #10-1-1 by…

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Answer 11

The 12V power circuit on a 7-way trailer connector is separate from the lighting circuits. If you use an adapter like the Hopkins Multi-Tow Trailer Connector Adapter #HM47675 the 4-and-5-pole connector will carry the stop/turn/tail light signals for…

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Answer 12

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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