Troubleshooting No Brake or Turn Signal Lights On Trailer Wiring Harness of 2013 GMC Acadia

Updated 09/25/2017 | Published 09/23/2017

Products Featured in This Question

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

(485)

$43.72

Hook Probe Circuit Tester

(66)

$13.12

Question:

I have 2013 Acadia, i had trailer hitch n w ire harness put in, wired the yrailer , i have r unning lights , but no hazzards ,brake,orsignal lig hts i have c hec ked aall w iting n fuses, i am w onering if it is the w ires i ha d put in w hen put in my hitch, its a agyer market plug yhat plugs into t he rear reciptic le on the rear of the Acadia f or after market insdtalls

asked by: Robert A

Expert Reply:

For your 2013 GMC Acadia, the T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118270 and similar wiring harnesses require installing the relays and fuses, so I recommend checking those locations for a bad relay since you have already checked fuses and wires. I've attached a video to assist.

You can use a circuit tester like # PTW2993 to check each function of your trailer wiring without a trailer connected to ensure function and isolate your possible issue to your vehicle versus trailer connection or trailer.

expert reply by: Jason S