Turn Signals Don't Work on Trailer With C56381

Updated 09/09/2021 | Published 09/08/2021

Products Featured in This Question

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

(10)

$61.41

Cordless Circuit Tester

(15)

$19.65

Question:

We hooked up wiring harness as instructed and brake lights work but turns dont on trailer.

asked by: Sera V

Expert Reply:

There are a number of troubleshooting steps you can take if your trailer's turn signals don't work after you installed the Wiring Harness # C56381 on your Hyundai. The first thing to do is take a look at your owner's manual to locate any trailer fuses or relays and ensure they are all there and in working order.

If they are, in order to determine the specific problem you will need a Circuit Tester like # PTW2979 and test the connector on your vehicle after disconnecting it from your trailer. Check the wiring going into your harness from your tail lights to see if those wires are carrying the correct signals, if not then the issue is with the vehicle wiring.

If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are okay then the issue is on the trailer side. The most important thing to do for this is check your trailer's ground wiring is good and attached to bare metal surfaces and free of any paint, dirt or corrosion.

I have added a link below to a help article on troubleshooting which I also recommend checking out.

expert reply by: Kyle S