Originally Posted by 99TJCrawler
So I can not get these gauge lights working. I messed with the dimmer switch and dont think it's the problem. How can I test the wires that go to the switch to determine which is the problem. Which one should be power? My headlights and tail lights work fine so I do not think it is the fuse either.
I don't mean to patronize you, and I know you said your tail lights work, but are these the running lights or brake lights?
I recently shorted out the fuse, and the brake lights work, just not the tail lights.
Other than that, I'd say just do a simple trace from the dimmer / switch to the panel. Or just get a test light and probe around.
You might also want to check to see if there's ANY voltage to the lights. Just pop the light out of the spedo and test it with a test light or DMM.
(They sell DMMs ate Freight Harbor, and while they aren't all too accurate, they're accurate enough for car applications and other applications. They're only about $3 bucks when on sale, and like $7 when not. I'd recommend buying one. You can test for low voltage and continuity [shorted wires])