Noticed the other night that with the park/head lights on the right signal stays on. Works inside when lights are off but dash lights and brake lights flash with signal. Now with lights on,it doesn't flash,just stays on. Any suggestions?

 

One of your light sockets may have a bad ground of course on the right side.

Since the turn signal is separate in the rear it pretty much has to be the front. Then it can be the rear depending on how the grounds are wired I don`t remember.

With a bad ground it is trying to grounding into the turn signal circuit.

I have found a fitting brush the best to clean sockets.

 

Thanx for the feedback. Will check today.

 

It sounds like a trailer wiring harness is wreaking havoc.