Turn sign issue

[78 Square]

Anyone know why my left side turn signal won't work at the front of the truck when I turn my lights on? And when I turn my right side signal on, the back marker light turns off. Everything works fine till I turn my lights on. Like I said, it's only the left side. It sounds like something is shorting out, but I have no idea where to look. Everything seems fine

 

[Georgeb]

I would check for a bad ground somewhere. Sounds like ground backfeed to me.

 

[firebane]

The ground setup for the lights in the front is a joke and so easy to break or become brittle after many years.

I need to do a repair on this myself.

 

[78 Square]

Alrighty thanks guys, I'll try that

 

[highdesertrange]

I would check the grounds first. highdesertranger

 

[78 Square]

I grounded it a couple of ways, even to the battery. Looks like I'm drawing power from somewhere else because it's affectin my tail lights and making them dim. Looks like I'll have to sift through the harness to see