Troubleshooting Function Issues With Tekonsha Trailer Wiring Harness # 118336

Updated 08/17/2017 | Published 08/16/2017

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Question:

I purchased a hitch and the above mentioned wiring harness for my 2005 MDX. Everything installed ok but the wiring harness will not work on the driver side tail light or signal light. The MDX tail lights work fine. I have tried two different trailers and both have the same issue. Both trailers work just fine on my ford F150. Any suggestions on what might be the issue??

asked by: John

Expert Reply:

The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118336 is a confirmed fit for your 2005 Acura MDX. I recommend using a circuit tester like # PTW2993 to troubleshoot. I recommend testing each function at the end of your 4-way connection. If they are working, then the issue is most likely with the ground wire on your trailers. If they are not working then you will want to test the individual functions on either side of the box. If the result is consistent, the issue is further upstream and you'll want to check function at the initial connection to your vehicle wiring. If it is not consistent, then you will want to replace the wiring harness.

expert reply by: Jason S