R Brake Light & R Headlight trailer wiring

[DonB4Lori]

All trailer lights work fine, exept when headlights are on, R brake is applied, no light at all on rt side trailer. Grounds look good, hooking into an Avalanche 5 wire bracket so that should be good. Any thoughts?

Thanks

 

[can-amsledder]

Re: R Brake Light & R Headlight trailer wiring

What you are describing makes no sense?.so it must be a ground.

 

[Mntom]

Re: R Brake Light & R Headlight trailer wiring

Probably not a ground issue. Was the trailer wiring in place for a while or did you just wire the plug?

 

[bruceb58]

Re: R Brake Light & R Headlight trailer wiring

Sounds like a ground issue to me.

 

[DonB4Lori]

Re: R Brake Light & R Headlight trailer wiring

The avalanche has the bracket installed, previous owner never used, so hopefully the truck wiring is OK. I figured it was a ground issue, I checked them to make sure they are tight, I will strip the wire ends and reapply terminals etc. It's wierd it's only one side goes out when headlights are on then brakes applied though.

Thanks for the replies

 

[Mntom]

Re: R Brake Light & R Headlight trailer wiring

GM has some weird ideas about the headlights and turn signals. I have seen them turn off both DRLs when turn signals are used and also turn off which ever side turn signal is used. I have a real strong hunch that is what is going on and not a ground issue. You need to find out what was done to put the trailer plug on your tow vehicle.