Troubleshooting Trailer Battery Backfeeding Into Truck Lights

Question

Question:

We put a new trailer connector on our camper, somethings wrong with the wiring, when we hook up the running lights and shut everything down, while running lights are disconnected and hooked to the truck, trucks running lights come on and it is draining the battery on the camper

asked by: Bill

0

Expert Reply:

From what I can tell of your explanation, it sounds like the trailer battery is backfeeding into the truck, causing this issue. The only way I can think of that this would happen is that your 7-way like the 7-Way Molded Trailer Wire Connector # H20043 is not pinned correctly. I'm not sure which trailer connector you purchased from us so the best I can offer is for you to ensure the 7-way is wired correctly by function instead of by matching colors.

I have added links to some help articles for you to check out as well.

expert reply by: Kyle S

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Answer 1

The lid of the Bright Way Trailer Breakaway ICU Kit with 12V, 5-Amp-Hour Battery, Charger, and Wire Loom #BW94FR that you referenced has a wiring diagram shown that details how it wires. Not seen is there is a single wire that runs up to running…

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Answer 2

I would not recommend installing a Diode #RM-690 on the brake line as this is a part which can fail and if it were to you could risk doing a lot of damage. While the Bright Way Push-to-Test ICU Trailer Breakaway Kit #BW94FR could risk damage to your…

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Answer 3

It doesn't sound like you are doing anything wrong from what I can tell. Based on how you are describing it with the backfeed, a diode may be the solution on that brake wire to help isolate the power. For that use the Roadmaster Single Park Light…

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Answer 4

If you wanted to prevent the 12 volt trailer wiring circuit from backfeeding when connected to your trailer's battery you'd have to use a diode like the part #RM-690. This will only allow the current to flow in one direction.

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Answer 5

If all you want is to prevent the 12 volt power supply of your trailer battery wiring from backfeeding onto your vehicle wiring or vice versa what you need is a one-way diode like part #RM-690. This only allows current to flow in one direction so…

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Answer 6

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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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

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 11

Hey Doug, congratulations on the new truck and trailer! That is a nice setup for sure. Unfortunately, the backup cameras aren't going to integrate with your dash cam system. Since you're already prepped for Furrion, and it is the best on the…

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Answer 12

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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