Left Turn Signal Causes all Trailer Lights to Flash and Right Turn Signal Does Nothing

Published 06/12/2008

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Question:

I need to rewire a boat trailer to fit a 4 pin attachment. I have a 97 Nissan pickup and have already purchased and installed the pigtail. All lights blink when I hit the left turn signal, no lights blink when I hit the right turn signal. Is there a diagram out there somewhere that can help me? Note: My trailer has six lights: 1 above each wheel, 1 at each back corner low and 1 on each side set on poles to guide the boat into the trailer if the trailer is underwater. What lights are brake lights, turn signals, tail lights, etc.

asked by: Gabe

Expert Reply:

If you have the Hopkins Wiring Harness # HM43505 installed on your 1997 Nissan pickup you will want to check the 4-flat connector with a circuit tester # PTW2993 and make sure that the wiring on the vehicle is correct and that you have a good ground.

It sounds like a ground problem on the trailer is what is causing your lighting problem. You will want to check that the white ground wire on the trailers 4-way is properly grounded to a good, clean area of bare metal on the frame.

You will also want to make sure that the trailer lights are grounded. If the trailer lights have a white ground wire coming out of the light, you will want to make sure that you have that wire grounded to a good clean metal area on your trailer. If the taillights do not have a white ground wire you will need to make sure the light is getting a good ground with the mounting studs. Some trailer lights are grounded by the studs that attach the lights to the trailer.

On the trailer you can use a circuit tester to test the wires going to the lights to determine which function is for that light.

expert reply by: Mike L