trailer lights

[lynnboy021]

I have a new light setup with wires and the problem i am having is when i connect my 4 pin flat to 7 round adapter to my truck my trailer lights don't work too good.... they are to dim and when i turn left it works fine but when i apply the breaks the lights go dim and the right light starts to flash.... what can my problem be??? I know for a fact it's not the trailer lights cuz I test it all with my power probe. So it must be the truck ( 02 chevy avalanche) or the 7 round to 4 pin flat adapter???

 

[BigDfromTN]

Sounds like a classic bad ground issue.
Check your ground wires to the truck and trailer.

 

[Mel Taylor]

Almost certainly a bad ground somewhere. Usually between tow vehicle and trailer.

 

[smokeonthewater]

Test it with the boat NOT hitched to the truck

 

[T_Herrod]

Sounds like you are grounding through the ball hitch. Disconnect the hitch and see how many lights work.

 

[scarabite]

Where do you live i know in Michigan every 2-3 years my 7 way plug gets corroded after 5 it needs replacing even with its fancy plastic cover salt finds a way in. That would be restricting the power flow

 

[scarabite]

Where do you live i know in Michigan every 2-3 years my 7 way plug gets corroded after 5 it needs replacing even with its fancy plastic cover salt finds a way in. That would be restricting the power flow

 

[agallant80]

+1 on the ground issue. Some of the best advice I have ever recieaved reguarding trailer lights is not to ground things to the frame, run a ground wire to each light back to the harness.

 

[bruceb58]

Running each ground back to the connector is a waste of wire and unnecessary. If you have a good ground to the frame at each light, you will never have a problem.

 

[Mel Taylor]

+1 on the ground issue. Some of the best advice I have ever recieaved reguarding trailer lights is not to ground things to the frame, run a ground wire to each light back to the harness.

Yep, after fighting light and ground issues for a long time, I finally did just what you did and have had nary a problem since then.