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Testing Converter Box of Tekonsha Trailer Wiring Kit part # 118438


I installed harness a few years ago worked fine no issues. Have not used in a while wiring was stowed away neatly in compartment. Tried to use it last week on a friends trailer. I had no lights put a LED 4 prong test plug on no lights. Bought it home tested ground to battery 12 volts tested pins with head lights and then hazards no voltage.checked 7.5 amp fuse for continuity all good. Was wondering if you had any suggestions maybe check the input to converter? If so what wires and what voltage would I be looking for? I would appreciate any suggestions just want check every thing before I order new harness. Thank you for your time


Helpful Expert Reply:

What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # PTW2993 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself out and would need to be replaced.

Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause the box to short out like corrosion or cut/exposed wiring. These boxes don't usually go out unless there is a short on the trailer that takes it out.

If there isn't input voltage for the converter then the problem is the wiring of the wiring kit. You will need to check to make sure it's making a solid connection to the correct circuits.

helpful expert reply by:
Jameson C

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