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Old 12-23-2013, 04:12 PM   #1
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Need help asap

Hey guys, I was driving today and both of my headlights went out but the side markers and rear lights all still work. I've checked fuses and can't seem to find any blown one. I have H4 headlight conversions also if that helps. What do you think it could be?

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Old 12-23-2013, 04:14 PM   #2
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relay? have you upgraded your wiring harness?

could be your left side multi-function switch as well

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Old 12-23-2013, 04:17 PM   #3
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Ballasts maybe? If they're wired together.... one goes bad both will go out.
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Old 12-23-2013, 04:17 PM   #4
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relay? have you upgraded your wiring harness? could be your left side multi-function switch as well
I have not upgraded the harness and do you think it's the multi function switch since every other light works?
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Old 12-23-2013, 04:29 PM   #5
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Do you have power at the socket when the bulb should be on?

I had to replace my mfs because it got stuck on brights, everything else on the mfs worked 100% normally
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Old 12-23-2013, 05:21 PM   #6
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Are you getting high beams or are both high & low out? If both are out, double check fuse 10 in the PDC. It can also be the switch since the headlights use different contacts than the park/tail/side & cluster lights use. If only low beams are out it could be the headlight dimmer switch is bad.
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Old 12-24-2013, 12:27 PM   #7
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Just checked and I'm getting power at the ballasts when the headlights should be on but the high and low beams both are not working but everything else is
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Old 12-24-2013, 12:37 PM   #8
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ballasts? is this an HID setup?

how much power at the bulb socket? seems like if power is there, the bulbs should work, if they arent burnt out
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Old 12-24-2013, 01:44 PM   #9
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ballasts? is this an HID setup? how much power at the bulb socket? seems like if power is there, the bulbs should work, if they arent burnt out
I was getting 7V at the ballast and I still have the original headlights which I tried plugging in, also didn't work, and no not an HID setup
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Old 12-24-2013, 01:52 PM   #10
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i was unaware that tj's ever came from jeep with a ballast for the headlights.

if you are getting some voltage but not close to 12v, i would guess its in the wiring.
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Old 12-24-2013, 10:37 PM   #11
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i was unaware that tj's ever came from jeep with a ballast for the headlights.

if you are getting some voltage but not close to 12v, i would guess its in the wiring.
Sorry, meant the bulb socket not the ballast
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Old 12-25-2013, 01:21 PM   #12
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Update: just checked bulb sockets again and now I'm getting no reading when the headlight switch is pulled out. Does this indicate the switch is bad?
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Old 12-25-2013, 02:23 PM   #13
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thats possible, i'm not sure how to test the switch. probably a good idea to check your fuses again

i believe its fuse 1 in the fuse block and fuse 10 in the PDC
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Old 12-25-2013, 03:09 PM   #14
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thats possible, i'm not sure how to test the switch. probably a good idea to check your fuses again i believe its fuse 1 in the fuse block and fuse 10 in the PDC
Just checked both fuses and both are not blown, pretty sure I've checked every fuse in both fuse boxes.
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Old 12-25-2013, 03:30 PM   #15
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What year is your Jeep?
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Old 12-25-2013, 04:19 PM   #16
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the more i think about this the more i lean towards the left side MFS. just not sure how to test that

the headlight wiring system on our jeeps is rather basic. just a couple fuses, the lamps, and the MFS. the flaw is the lack of a relay, which causes the MFS to take the full power load, which can lead to a burnt out MFS
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Old 12-25-2013, 07:56 PM   #17
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The jeep is a 99 and I was starting to think it was the switch also
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Old 12-25-2013, 09:16 PM   #18
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That switch should be the same on a neon in the junkyard if you have one near by. No Jeeps in junkyards. Well wranglers anyway. Tons of neons.
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Old 12-25-2013, 09:21 PM   #19
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That switch should be the same on a neon in the junkyard if you have one near by. No Jeeps in junkyards. Well wranglers anyway. Tons of neons.
that's the damn truth....
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Old 12-27-2013, 10:21 AM   #20
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My 99 has a pull switch for the headlights. Multifunction only controls the brights I believe.
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Old 12-28-2013, 11:29 AM   #21
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The pull switch on my 99 caused my headlights to go out. Driving down the road and hit a bump and the headlights and taillights stopped working. If you wiggled the switch they would come back on. Bad switch caused some very weird, intermittent issues.
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Old 12-28-2013, 06:31 PM   #22
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When you check voltage at socket what Meyer ground did you use body engine or ground wire in socket

If you used ground wire in socket maybe that ground is failing/failed that would explain prior low and current no voltage

Compare voltage at socket wire with switch on between meter ground lead on alt body and meter ground lead to black wire in headlight socket both times with red meter wire on turned on headlight wire in socket and report results

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