How to Charge Winch Battery on Trailer Using Tow Vehicle Alternator

Question

Question:

i got 2010 ford f150 putting a battery on a open car trailer to run a winch need to know how to hook wires so it will charge the trailer battery from my truck thanks

asked by: Jeff W

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Expert Reply:

For your application I recommend using the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1225D which helps to boost the power from your vehicle and is able to give your battery the best charge possible. To get this installed we have the Trailer Installation Kit # e79ZR which comes with all of the wiring, connectors, and fuses you need to get this properly installed.

You could charge your battery through the 7-Way with a 12V power wire ran from your F-150 battery but the problem with that is it just gives you a maintenance charge so it wouldn't increase the charge in your battery after you use it.

expert reply by: Jon G

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Answer 1

Electric brakes have 2 wires located at the back. One is for power and the other is for ground (it doesn't matter which is used for which function). The ground wires should be connected to the trailer frame. The only other place that would carry…

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Answer 2

You would not be able to charge your battery through the wiring on your 4-way trailer connector. Since your truck has a 7-way connector, you could maintain the power to the battery but not charge it. To begin, you would need to cut off your 4-way…

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Answer 3

Hey Joe, great question. You’re thinking about it the right way. You can technically run the charge line from the 7-pin’s 12V power wire straight to the positive post on your battery, but with lithium you’ll want to do it safely. Your truck’s…

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Answer 4

Hey Mike, yes the Dometic PerfectPower Battery Charger #GP95QR that you referenced would work if you ran the 12 volt power wire from your 7-way to it. It's rated for 10 amps which is easily provided by the 7-way. This will give an optimized…

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Answer 5

Hey Eric, I wish your 7-way could output that much amperage for any amount of time, but it just cannot. To use a DC to DC charger like the Ctek D250SE #CT99FR you are going to have to connect it to the start battery of your 2019 Ford F-150. Two…

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Answer 6

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 7

Nick, absolutely. Many vanlifers wire the Velit 2000R 12V AC Unit #VE87QV so it runs while the alternator tops off the batteries. It keeps the living space cool while driving long stretches, and when you park, your bank’s already partly replenished.…

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Answer 8

Hey Katie, yes we do have the 6k to 7k trailer brake assemblies available in individual assemblies like with the part #AKEBRK-7R-SA for the right hand side and the part #AKEBRK-7L-SA for the left hand side. Which side are you looking for and…

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Answer 9

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 10

First, the wiring on a trailer connector can provide a maintenance charge to a 12 volt battery on a trailer but it will not be able to fully charge it. The 12 volt circuit on a 7-Way is already circuit protected so a separate fuse or breaker should…

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Answer 11

To wire your electric brakes you will want to run 10 gauge wire #10-1-1 to one of the brakes and run it to the other brake, using butt connectors like #05732-2 to connect them. The grounds will not be spliced, each brake assembly should have its own…

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