Park & Tailight problem

[Gobbler256]

I am about to pull my hair out and need some advice. I have an 81 CJ5 and I recently replaced the front park/turn signal lights and new side markers I have blinkers, backup and hazard flasher working fine. But now can't get the tail lights or park lights to work. I've replaced the bulbs, fuses & the light switch but still no taillights or front park lights! Any advise??????

 

[Torxhead]

How about a little history, since you have had this vehicle, have the ever worked? First thing to check for an electrical problem on a CJ are the ground connections, you can run a jumper wire from the battery negative to the metal inside the tailight and the negative terminal on the parking light. Also check to see if you are getting any voltage to the positive side of the lights with either a test light or a voltmeter.