Weird problem, my blinkers work just fine and dandy, EXEPT when I turn my headlights on the left blinker doesn’t work in the front or back any ideas?
1990 Cherokee

 

What year is your Jeep?

 

Do you have LED headlights?

 

https://www.cherokeeforum.com/f2/att...osting-268677/

 

1990 renix 4.0

 

yes I do, I upgraded my grounding system n stuff, haven’t upgraded the wiring harness or anything but it’s always that left blinker and really no other electrical problems besides that

 

I'm betting there is corrosion in the front turn signal/parking light sockets and/or in the front side marker sockets.

 

you think that could cause both the front and rear to not work?

 

They are tied together ya know. Front and rear.
And the parklights and turn signals are tied together at the front.

Only one way to find out.........Philips screw driver and 10 minutes time.

BTW, do you have a trailer wiring harness at the rear?

 

Okay cool, check for corrosion and make sure I’m getting voltage to the front and rears.
& yes I do have a trailer wiring harness

 

If it's a hack job harness, look closely. It could have crappy connectors etc etc.

 

Was there a problem before changing the headlights?

If not, do you still have the old ones - or at least a couple of bulbs?

I'm not discounting the other suspects, & checking/cleaning the grounds can only be a good thing - but the trailer harness means a lot more work.