I have a 1999 xj Cherokee sport. I just upgraded all my exterior lights to led. All my tail lights work but my front signals wouldn't. Found out it was the relay which needed to be upgraded to an electrical relay that was led safe. I hooked it up and now my passenger signals work but my driver side doesn't. The left turn signal lamp stays lit on the dash but does not blink or click. Can anyone help me? Thank u!

 

Well, a couple of things come to mind. First I'd put the incandescent bulbs back in for test purposes. If the lights all work then, you have marginal grounds or a worn turn signal switch. Something creating a bit of resistance along the way.
Incandescent bulbs aren't nearly as touchy about contact resistance as LED's.
If the incandescent bulbs don't work, try putting your old flasher/relay in. If the lights work then you have the wrong part.

 

Thanks for the tip. I put the old bulbs back in and they work, so it's not the relay. How would I go about finding ground points to check if they are secure?