Big David

I went to replace my drivers rear taillight bulb because my parking light doesn't work.I took the bulb out & it was fine.What's causing this?

BTW,I have a trailer wiring that plugs into the stock harness.

Gee oh Dee

Check to be sure the socket has power to it using a multimeter?

DFlintstone

One "running" light out? Bulb and socket OK. On mine, I had problems with the ground. An easy check is to ground the metal part of the socket. I use a long wire right to the bat neg. (but anything to clean metal/ground will work), for testing.

Big David

Thanks.I didn't think about the socket being bad.

I can never diagnose my own car but I can alot of others.

DFlintstone

Because the socket is in plastic, it depends on a wire to ground it. I've found mine broken more than once.

Big David

Well,I didn't test the socket.I don't think thats the problem.I noticed that my front doesn't work either.

Headlight switch?

I looked in my Chiltons book & didn't see any fuse block diagrahm for my '98 XJ.