Troubleshooting Trailer Lighting Right and Left Signals Come On at the Same Time  

Question:

Expert Reply:

I am sorry to hear about your misfortune. We will get the lights working on your trailer. Starting at the trailer lights with 3 prong pigtails you should have 3 wires exiting the lights. On the left side the white wire should be grounded, the black wire should go to the brown running light circuit from the trailer connector and the red wire should connect to the yellow stop/turn signal circuit from the trailer connector. the right side will be the same except that the red wire will attach to the green stop/turn circuit from the trailer connector.

Once you have these wires connected, make sure that the grounds for the taillights are connected to clean points on the main trailer frame and that the ground at the trailer coupler is connected securely to a good, clean, metal frame surface.

I would then run the wiring back along the trailer looking for broken cut or pinched wires that may be causing any problems. This should solve your problems with the tail lights.

If you are still having problems once the trailer is wired properly then you will need to use a circuit tester, item # PTW2993 if needed, to test the connector on the vehicle. The vehicle connector should have an exposed male ground pole and 3 female poles. Connect the ground clamp from the tester to the male ground pole and test the female connections. You should get left stop/turn on the yellow wire, right stop and turn on the green wire and taillights on the brown wire going into the connector.

If you are towing the trailer with a vehicle that has separate turn and brake lights (amber turn signal lights) then a converter is needed to convert the 3-wire system on your vehicle down to a 2-wire system on the trailer. If you would like to let me know the year, make and model of your towing vehicle I would be glad to make a recommendation for the correct wiring harness.

expert reply by: Robert G

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