Troubleshooting Trailer Wiring Converter Box That Running Light Circuit Isn't Active

Updated 06/10/2019 | Published 06/09/2019

Products Featured in This Question

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

(726)

$56.65

Hook Probe Circuit Tester

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$12.94

Question:

I followed the installation video post install test but using a test light and it says the brown wire should have a constant signal from the running lights. I confirmed I have left turn signal , right turn signal, and brakes lights as described but no constant signal on the brown wire. What did I do wrong?

asked by: Garrett

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.

expert reply by: Jameson C