Can Converter Box of Trailer Wiring Harness be Tested for Function

Updated 08/05/2019 | Published 08/04/2019

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

(91)

$46.70

Hook Probe Circuit Tester

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$13.94

Question:

Hello, I use a direct ground wire from battery and dedicated gropund wires to both trailer lights. wires to wires no connecton to car chassis or trailer chassis Everything was working a month ago, but this morning, the indicators, emergency flasher and brake light functions no longer work on the trailer Running lights do still work on the trailer The trailer lights each have three wires and all are still connected well. Could the module be bad?Thank you.

asked by: Richard W

Expert Reply:

It is very possible the converter box has gone bad but there is a way to test the box. 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