Troubleshooting Driver Side Lights Not Function After Curt Wiring Install 2005 Jeep Grand Cherokee

Updated 06/16/2015 | Published 06/15/2015

Products Featured in This Question

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

(37)

$67.80

Hook Probe Circuit Tester

(60)

$13.03

Question:

I recently bought this connector. And I noticed today that after installing the wiring harness. The drivers side brake light and blinker no longer work. And they worked before I put this harness on. Is it so,ething in the converter box? I did everything according to the instructions. All the lights on my trailer work for the 4 flat plug in. Just not on my jeep

asked by: Ben E

Expert Reply:

You will want to first try connecting and disconnecting the driver side connectors of the part # C55451 to hopefully clear out any misconnection that it may have. If it still doesn't work you would want to test the converter box to determine if it is at fault.

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