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How To Install a 7-Way On a Truck with Separate Brake and Turn Lights


Hello, I have tried two different tail light conveters on a truck with a work body that has the foreign light set up. Neither one of the conveters work. I see there is a ground coming in and out of the converter. Does this need to be the only trailer ground? i have tried the powered and the non powered converters with no luck. i have a good power source to the red wire when the brakes are applied. The left and right turn signals, marker lights and brakes work as they should. Any suggestions would be apppreciated.


Expert Reply:

It sounds like you are trying to install a trailer connector on a vehicle with separate brake and turn signal circuits. If that is the case then you will need to use a converter box for this which it sounds like you are already aware of. I am not sure which ones you have already used but the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness part # 119190 is what I recommend. This is a powered converter which is what I recommend as it reduces the strain on the vehicle's tail light circuit. If you have all of the wires attached properly then there is no reason this would not work. The green wire goes to the right turn signal circuit, the yellow wires goes to the left turn signal circuit, the red wire goes to the stop light circuit, the black wire goes to the battery, and the white wire goes to a ground. There is only one ground for this trailer connector.

In order to convert the above 4-way to a 7-way you can use the 7-Way RV and 4-Way Flat part # ETBC7.

expert reply by:
Conner L

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