Troubleshooting Interior Lights Not Working for Enclosed Trailer

Published 12/19/2018

Products Featured in This Question

10 Gauge Wire - Blue Primary - Per Foot

(104)

$1.89

Cordless Circuit Tester

(15)

$19.26

Question:

I just purchased an enclosed trailer with interior lights. I have all exterior lights working but the interior lights dont work when hooked up to My 2007 Chevy Trailblazer. Tested the trailer lights and they do work when hooked up to a tester. Which fuse runs the axillary lights in trailer? The axillary terminal on the truck plug doesnt work.

asked by: Bob W

Helpful Expert Reply:

The interior lights of your enclosed trailer are likely connected to the 12V (Auxiliary) power pin on the 7-Way of your trailer. You can verify this by applying 12V power from a separate battery to this pin and seeing if that supplies power to your lights (see attached picture).

If your 2007 Chevy TrailBlazer doesn't have power on the corresponding pin (see attached photo) then that would explain why your interior lights aren't working. I took a look at the online owner's manual for your TrailBlazer and you may want to try checking the #32 fuse in your engine fuse box or the #46 fuse in the fuse box located under the rear seat.

Should you find that both fuses are good and you still don't have power then you may simply need to replace some of your wiring. Try tracing the wiring from that 12V power pin to your battery to see if any places are damaged. If they are just replace them with 10 Gauge Wire # 10-1-1. You can also use a circuit tester like part # PTW2979 to see where the signal is lost on that 12V wire.

Let me know if you are still having issues and I can help you troubleshoot further.

expert reply by: Jon G