Done everything I could think of and I still can't get my reverse lights to work. It's a 88 comanche 4.0 5speed short bed. I've cleaned the rear tail light harness connector. Replaced the trans fuse a few times. Cleaned the connector on the drivers side of the trans. Anything I'm missing?

 

Long shot but have you checked the bulbs?

 

Replaced bulbs. Cleaned all the connectors and connection points. How would I be able to test the switch on the transmission?

 

is your NSS bypassed?

nevermind its a stick so guessing you dont have a nss?

 

Some people say they still have a NSS, some say its called a clutch safety switch. If his was faulty the jeep wouldn't start at all, but i suppose it could be gunked up just enough to cause the light issue.

You could try popping a bulb out and throwing a multimeter on the socket and see if it gets any voltage when in reverse. I am willing to bet its that NSS at this point, do you need to put the clutch down to start the truck?

 

It's a 88 and I can start it without clutch. Even if its still in gear. When jumping the connector on the trans the reverse lights work.

 

Sounds like you need a new switch then. Does your 88 have the stock BA/10 tranny?

If yes then I think this will fix your issue:

http://www.4wheelparts.com/Drivetrai...pn=CRO53004522

 

How can I tell if its a BA/10 trans?

 

http://www.novak-adapt.com/knowledge/ba10_5.htm