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How to Test Converter Box of Trailer Wiring Harness


Any suggestions on what may be wrong 2013 Chevy Malibu. I have put a voltage reader on the the red cable to the black power cable , and I have power. In the trunk the power cable lights up so there is power there. When I test the driver side wire harness its completely dead no lights. The 4 way flat tested and no lights. Wondering if my module box may be bad??? Just bought this on Amazon.


Expert Reply:

The first problem is you bought the harness from Amazon and not us...just kidding!

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.

expert reply by:
Jameson C

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