Troubleshooting Turn Signal not Working on Trailer
We have rewired the the hole trailer and replaced the ground wire. We have all the lights working but the turn signal what could that be
asked by: Kimberly P
There are numerous reasons why the turn signal on your trailer may not be working so you will need to go through a few different troubleshooting steps to try and figure out why.
The first thing to do is take a look at your owner's manual to locate where any trailer fuses or relays and ensure they are in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - 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 correct then your issue is likely going to be with the trailer side wiring. You will also want to check both your vehicle and trailer connectors for corrosion, which can be green or white in color. A build-up of corrosion can interfere with the signals getting through the connectors so if it is present you will need to either replace the plug or clean the corrosion.
An important issue you will want to take a look at are the ground connections, as they can be the cause of numerous lighting problems. You'll want to make sure your grounds are securely attached to bare metal surfaces free of any paint, dirt or corrosion of any kind. Also check your wiring thoroughly to ensure there are none that are crimped, broken or otherwise damaged.
I have added links to a pair of help articles on trailer wiring, including a troubleshooting guide which I highly recommend taking a look at.
- Q&A: Testing for Proper Voltage on the Brake Output Circuit
- Q&A: Trailer Brakes Lock Up When Connected to Truck
- Article: Trailer Wiring Diagrams
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Article: Testing Trailer Brake Magnets for Proper Function
- Q&A: Trailer Lights Work But Brakes are Not Working
- Q&A: How Long Does It Take to Install B&W Turnoverball Underbed Gooseneck Trailer Hitch BWGNRK1020
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Troubleshooting Brake Controller Installations
- Q&A: How Much Voltage Should Be Applied To Brakes on Trailer w/ Electric Brake Controller
- Q&A: Troubleshooting Voltage Drop to Trailer Brake Assemblies
- Q&A: How to Test Brake Controller without Trailer Connected
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: How to Install a Brake Controller on Chevrolet / GMC 1999-2006 Pickups