I see lots of diagrams for frontTJ turn signals. but none for j.K's. Also am looking for ground locations
I believe I have a bad ground. Turn signals work, but when I turn on headlights the passenger light goes out and dash indicator goes faster than normal. Also right park lamp doesn't go on when activated. Any help would be appreciated!!!!! I have a 2010 JK

 

"Faster than normal" = open circuit. What are the fault codes?

 

No fault codes.

 

Did the issue just start or where either of them disconnected and reconnected and the problem showed up?

 

I just had this issue on my 2009 JK. There is a ground post on the radiator support right near the airbox. It has a 10mm nut on a post and then there are several wires crimped to a single eyelet terminal. Remove the nut, cut off the crimped terminal and strip back the wires so you can crimp on new eyelet terminals and connect them to the ground post.

Cut as little as possible off the wires as there isn't a ton of slack to work with.

Not sure who at Jeep thought it was a good idea to crimp several wires together and then never weatherproof teh ground. The copper oxidizes and although the terminal is grounded, you have some wires that aren't.

That's why the turn signal might work with the lights off but once you're putting the extra load thru the circuit, the ground just can't handle it and they don't work.

Hope this helps someone later on. I literally just did this today.