Running Light Voltage is Good Going in But Not Coming Out of Trailer Wiring Harness C56150

Question

Question:

Left and right turn signal both produce good voltage 12.4 van off - 13.3 van on. Turn signals and brakes work fine on trailer. Tail light brown only puts out a very steady 3 volts after the black box even though the car harness before the black box puts out 12. Tail lights on trailer work fine with other vehicles. Is there something I need to do to get 12 volts out of the brown wire? Relocating the ground doesnt change the voltage.

asked by: John

0

Expert Reply:

Since the voltage is correct going into the converter box but not correct coming out, that indicates that there is something wrong inside the converter for wiring harness # C56331. There is no fix for this and the whole harness will need to be replaced. The Curt wiring harness has a limited one year warranty.

I have included a link to our help article that you can view on testing 4-Way trailer wiring harnesses as well.

expert reply by: Michael H

0

Answer 1

It sounds like you have one of two things going wrong on your trailer wiring setup. Either you aren't using the correct circuits when you wired up the Curt Harness part #C59236, or the trailer you are towing has weak grounds and can't handle…

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Answer 2

Aluminum trailer frames or bodies can cause grounding issues so I suggest using a separate ground wire that runs from the rear of the trailer up to the main ground post in the junction box like #38656. You can join the ground wires for the individual…

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Answer 3

The only fuses that look like they might be related to your trailer running lights are M14 (Trailer Tow) and M17 (Left Tail/License/Park Lamp, Running Lamps). These will be located in the fuse box under your hood. It could also be that you have a…

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Answer 4

Something is going on with the installation of the Curt Wiring Harness part #C56331 on your 2012 Dodge Grand Caravan. It should not be blowing the fuse under normal towing situations, but even more so without a trailer being connected. What I would…

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Answer 5

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 6

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 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

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 9

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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Answer 10

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 11

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 12

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

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Running Light Voltage is Good Going in But Not Coming Out of Trailer Wiring Harness C56150

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