Im working on a 98 mustang, the LH side tail lights went out, no parking, brake or turn lamps. RH side works fine.
All wiring looks fine, Any ideas???

 

Considering your parking lamps and brake/turn lamps are on different circuits and the other side works fine, I'd check for a bad ground in the left hand (assuming drivers side), wire harness. Especially if the driver side fronts are working fine. That's assuming of course it's not a freak thing that all of your rear drivers side bulbs burnt out including the dual filament ones, (not likely). JMO
Good luck.

 

It does sound like a bad ground, but I can measure from the frame gnd. to the park or stop lamp wire at the harness connector and still no power.

 

Update:

I went back to work on it again and the lights were working....weird.

Thanks for the help tho.....

 

Sure sounds like a bad ground my friend. Glad they are working again though.