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headlights won't turn on

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Old 05-14-2012, 10:52 PM   #1
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Default headlights won't turn on

So randomly I got in my jeep to leave the house and I noticed my headlights weren't coming on. They've worked fine up until now. I checked all the fuses under the dash and under the hood and none of them are blown. Then I had a neighbor who's a mechanic come by and check em out with an electrical tester and he said they're all ground and no power. I've been using my fog lights so faar. But I have no idea what the problem is. My multi function switch has been broken as far as switching from hi beam to low but turn signals have always worked. Any ideas?
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Old 05-14-2012, 11:37 PM   #2
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Headlight switch. Cheap and easy if you can kep your cool. Its a job that takes 3 hands, but you only have one..

DISCONNECT BATTERY

Reach up under your dash as if to gab the back of the headlight switch. on the underside there is a button. Depress the button and pull on the headliht SWITCH lever. It comes out revealing a flat head lock nut

Unscrew the locknut and the switch is free......

Now you just have to unhood the wiring harness which has a plastic clip.... yep .... one handed.

you can get a slim flathead through the Swithc Lever opening that you can use to unclip the small harness.

Reconnect battery

test

reinstall
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Old 05-14-2012, 11:51 PM   #3
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Quote:
Originally Posted by jeepsterokc
So randomly I got in my jeep to leave the house and I noticed my headlights weren't coming on. They've worked fine up until now. I checked all the fuses under the dash and under the hood and none of them are blown. Then I had a neighbor who's a mechanic come by and check em out with an electrical tester and he said they're all ground and no power. I've been using my fog lights so faar. But I have no idea what the problem is. My multi function switch has been broken as far as switching from hi beam to low but turn signals have always worked. Any ideas?
If they come on when holding ur dimmer in them its ur Switch. 10 min fix $16 part
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Old 05-15-2012, 02:55 AM   #4
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It's a bit troublesome that none of your fuses show power...but the headlights aren't fused, so we'll ignore that for now. (I suspect an error in the test...dead fuses would show more symptoms than just no headlamps)


The headlamps are fed directly from the battery, through a fusible link, to the headlight switch, then through the dimmer switch and off to the bulbs. The headlight switch contains a 25a breaker for the headlights.

I'd start by checking for +12V at the red wire on the headlamp switch. Should be there since your fogs work...but check anyway.
If nothing there, the problem is between the battery and the switch. Likely the (red) fusible link @ the starter relay battery terminal.
If you have power there, check the red/white tracer wire coming off the switch. There should be +12V there with the headlight switch activated. If not the switch is bad.
If you have power at that point, move on to the dimmer switch.
Red/white is +12V in from the headlight switch.
Gray is low-beam out, Gray/white is high-beam out.

Last edited by Radi; 05-15-2012 at 03:00 AM.
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