Trailer Lights

[AdamRCarr]

When I plug my boat trailer into the truck, all the lights came on. Hazards work. When I use a turn signal, the tail lights alternate flashing back and forth. First the left blinks, then the right blinks, then the left, then the right... Also, when the brakes are engaged, all the lights go off. Any ideas on how to fix these problems?

 

[Captain Ahab]

Sounds like you have a ground messed up or crossed


Always ALWAYS when dealing with trailer lights triple check the ground wires 1st


The alternating thing is a new one to me - never saw that before

 

[PATRIOT2]

What type of vehicle?
Aftermarket, powered tail light converter?

 

[AdamRCarr]

I don't think the vehicle is the issue, because I plugged a different trailer into the socket, and it worked perfectly. Thank you for the advice about the ground wire. I have cleaned and replaced all contact points with the trailer, so hopefully that will solve the problem.

 

[Wallijig]

That's what happens when use Christmas light bulbs, switch to standard all should be fine. J/K LOL

x2
It sounds like ground issue to me also.

 

[lckstckn2smknbrls]

I run a white ground wire to each light.

 

[mpknls]

it sounds like a bad ground had the same prob i run a new ground wire from the front of the trailer to each light