Troubleshooting Right Trailer Brake Light Not Working When Connected to 1999 Isuzu Trooper

Updated 05/21/2024 | Published 05/19/2024

Products Featured in This Question

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

(5)

$32.21

Hook Probe Circuit Tester

(60)

$12.41

Question:

Hello! I have a question about the hitch wiring for my 1999 Isuzu Trooper. All of my trailer lights are working except the right brake light. The wiring is correct on the trailer side, so the issue must be in the Trooper hitch wiring. The right turn signal works which is the same wire as the brake light so Im thinking the issue is where the Trooper wiring connects to the hitch wiring in the drivers side back area. Any insight why the right turn works but not the right brake light? It looks like the Trooper has a bunch of different wires condensing down into the 4-pole hitch wire. Any help would be greatly appreciated!

asked by: Wulfpak

Expert Reply:

If the issue is on the vehicle side of your 1999 Izuzu Trooper this will likely mean the converter module which combines the wiring itself is damaged and needs replaced. We do have the Curt 4-Way # C55339 which plugs into a factory connector and only has a single brake light input. This tells me the internal portion of the module is failing to sent power to the right brake light if your right turn signal and left brake lights are functioning correctly as you said.

You can always use a Test Light # PTW2993 to verify the power going into and out of the module to ensure that is your issue.

expert reply by: Bud M