Whenever I turn on the parking lights or headlights the left blinker doesnt work. The blinker on the gauges and the exterior blinker doesnt work. Where do I start to look and what do I look for?

 

Am I missing a wire? Why wont the left blinker work when the sidemarkers or headlights are turned on?

 

Look at whats different about the right side versus the left :-P Maybe a fuse or loose connect on left blinker?

 

sounds like a problem with the relays.

when you swapped in the jdm lights, what all did it involve?

im thinking the relay that controls the turn signals isnt getting the correct signal. i dont have the presence of mind right now to think this through correctly, but i would check and compare the grounding points for the left turn signal with that of the right turn signal. maybe a wire was crossed or not grounded correctly during your install.

 

Did just what I said and found out that the ground going to the left blinker was switched with one of the others so I spliced and soildered, yAhoo! Everything is ok now... but my horn.. check my "no honk" thread.

 

glad ya got it resolved...good think you didn't ask me cause I would have said you were low on blinker fluid!