All rear lights except fog, direction and brake lights do not work! Front markers and parks is OK. My Chilton do not cover chassis electric on my 93 cherokee, so I do not know where to look first. I have checked out fuses, they seem to be the same front/rear. Does anyone have an idea where to look for this fault?

Try downloading this diagram:
http://www.lp2aenergy.com/PDF/93XJ/

Try downloading this diagram:
http://www.lp2aenergy.com/PDF/93XJ/

Thanks, that helped me out. I could not find the faulthy point, but replaced the actual wire.

BB.