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Unread 01-20-2013, 05:02 AM   #1
Dewayne
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Dimmer Switch

83 CJ7 having problem with the dimmer switch (which I have replaced already) each time I hit the dimmer switch to bright lights my head lights go out and by parking lights begin to blink. Any suggestions?

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Unread 01-20-2013, 06:58 AM   #2
keith460
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I can't see how that is possible but anything a PO has done to the wiring is anybody's guess.

Do the "low" beams work normal? There is a red wire w/tr (wire with tracer stripe) coming off the headlight switch to the dimmer switch. From the dimmer switch on "low" is a gray wire to headlights low beam. From dimmer switch "high" comes a gray wire w/tr to headlights high beams. That's it and ground wire of course to the headlights.

Does the "high" beam indicator light illuminate on the speedometer gauge when the dimmer switch is set to "high"?
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Unread 01-20-2013, 08:25 AM   #3
REDnBLUES
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Kinda sounds like a bad headlight switch except for the blinking parklight thing but I suppose it could be the curcuit breaker causing it if there was some "creative wiring".
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Unread 01-20-2013, 10:44 AM   #4
Cutlass327
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I think redandblue may be on to something. The blinking is not rhythmical is it? More on a random flashing?
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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Unread 02-28-2013, 06:16 PM   #5
DoubleDown
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Mine is doing the same thing, and after I replaced the dimmer switch on the floor it got better, but is acting up again. I did notice that the wires going into the switch were all corrorded. Does anyone know where I can get the harness that plugs into the switch, I think thats where my problem is.
From Jeep or Junkyard, or replace by hand ?
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Unread 05-22-2013, 08:31 PM   #6
rsegriggy
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You can get a replacement harness that plugs into the switch from most auto part stores. I got one from Advanced Auto last week. They had to order it, it came in the next day. $5.

HOWEVER: I wasn't happy with how it connected to the floor dimmer switch I picked up at the same time. The plastic tabs would hit the dimmer and left about 1/4" of the terminals exposed between the clip and the switch. Is that normal for replacement parts?
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Unread 05-23-2013, 03:02 AM   #7
John Strenk
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Quote:
Originally Posted by Dewayne View Post
83 CJ7 having problem with the dimmer switch (which I have replaced already) each time I hit the dimmer switch to bright lights my head lights go out and by parking lights begin to blink. Any suggestions?
Quote:
Originally Posted by REDnBLUES View Post
Kinda sounds like a bad headlight switch except for the blinking parklight thing but I suppose it could be the curcuit breaker causing it if there was some "creative wiring".
Quote:
Originally Posted by Cutlass327 View Post
I think redandblue may be on to something. The blinking is not rhythmical is it? More on a random flashing?
He didn't say the headlights were flashing. Just the parking lights.
Is it the parking lights or turn signals that are flashing?

One thing they have in common is ground for the grill.

Questions,
1. On High Beam, does the High Beam indicator on the speedometer Light up
2. Are the low Beam lights at full brightness
3. On low beam, do the turn signal indicators in the speedometer light up.
4. Do the turn signals work with the headlights off.
5. Does the emergency Flashers work with the lights off or on.
6. DO the parking lights or turn signals lights get brighter when you turn the high beams on and activate the turn signal or emergency /hazard lights?
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Unread 05-23-2013, 04:39 AM   #8
jeepdaddy2000
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If I didn't know better, I would say it is running a circuit breaker on the main feed. A direct short on the high beam side, past the dimmer switch would cause the highs to go out and the lights to blink due to the breaker resetting itself.
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Unread 05-23-2013, 05:11 AM   #9
keith460
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Its been 5 months since the first post, either he found the problem or forgot about his original posting and never came back to write about his findings or fix.
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Unread 05-23-2013, 05:14 AM   #10
John Strenk
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But the parking lights don't get their power from the same circuit as the headlights. SO if the CB opens up and resets there should be no changes in the parking lights.
Unless there was some surprising rewiring by the PO.
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Unread 05-23-2013, 05:15 AM   #11
John Strenk
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Quote:
Originally Posted by keith460 View Post
Its been 5 months since the first post, either he found the problem or forgot about his original posting and never came back to write about his findings or fix.
Thanks for the dope slap. .
I didn't realize it was this old....
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Unread 05-23-2013, 10:27 AM   #12
Cutlass327
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Well, at least if anyone else is looking for help on this issue, there is more things to look for before starting a new thread!
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Unread 05-23-2013, 12:20 PM   #13
hp_lovecraft
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Quote:
Originally Posted by John Strenk View Post
But the parking lights don't get their power from the same circuit as the headlights. .... Unless there was some surprising rewiring by the PO.
Mine Jeep has surprising rewiring like that. The PO replaced the entire "lights switch", which a big toggle that turns on the headlights, parking lights, and dash lights together.

It was on of those "low priority things to fix as soon as I have free time".... and that was 4 years ago. Technically... I have no problem with it since you generally have all those things on at the same time anyway. Oddly, the fuse has not blown, so I probobly should take a closer look one of these days!
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Unread 05-23-2013, 03:23 PM   #14
Balvar24
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Quote:
Originally Posted by keith460 View Post
Its been 5 months since the first post, either he found the problem or forgot about his original posting and never came back to write about his findings or fix.
Or, his healights went out at the worst possible time.
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Unread 05-23-2013, 03:24 PM   #15
keith460
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Originally Posted by Balvar24 View Post
Or, his healights went out at the worst possible time.
Ohhh, that would hurt!
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