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Old 01-23-2012, 07:34 AM
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Alleneoc Alleneoc is offline
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Head lights

So my son is driving the Jeep Friday night and he calls me and said the lights and going off and on, and go dim and go off and than come back on and flash on and off and go dim.

I'm was at a fire truck parade ( which we set a new world record for the most trucks in one parade 271 trucks) so I told him we would look at it Saturday when he got home.
I look look at it but it seem to be just the light and it's all the light not just the head lights.
So could it be the head light switch?
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Old 01-23-2012, 07:48 AM
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I have the same problem. A little wiggle on the connector to the headlight switch fixes it every time.
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Old 01-23-2012, 07:48 AM
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Bad connection at the headlights. Mine do it on occaision.
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Old 01-23-2012, 07:49 AM
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I am not an fsj expert nor do I own one, I kind of hover the forums here, but when I read the post I was thinking headlight switch even before you said it. I would definitely check it out. so you are able to reproduce the problem? Does it seem affected by vibration or anything else? (amount of time lights are on, etc) does it do it when the lights are in the parking light position? I'm guessing its the switch of a loose connection.
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Old 01-23-2012, 07:49 AM
mnewxcv mnewxcv is offline
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Quote:
Originally Posted by j20brett
Bad connection at the headlights. Mine do it on occaision.

but his affect all the lights not just headlights
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  #6  
Old 01-23-2012, 07:53 AM
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it will do it sitting still in the driveway
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Old 01-23-2012, 09:24 AM
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This is kinda tough to do, since there is not much slack in the wiring, but you want to pull the connector block from the light switch and look at the individual wire ends in the block. The battery wire end will get hot and melt itself loose from the connector block. Good time to research headlight relays.
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Old 01-23-2012, 09:36 AM
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Quote:
Originally Posted by lkmarsh
This is kinda tough to do, since there is not much slack in the wiring, but you want to pull the connector block from the light switch and look at the individual wire ends in the block. The battery wire end will get hot and melt itself loose from the connector block. Good time to research headlight relays.

I have been looking in the the relays
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  #9  
Old 01-23-2012, 10:30 AM
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Possible body ground issue? Maybe the bolt is loose, or the ground wire is no good.
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  #10  
Old 01-23-2012, 10:49 AM
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letank letank is offline
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The headlight switch - for the parking light position- before finish reading I was going to ask if you have done the ammeter bypass.... but it should be done to prevent jeep BBQ.
As said recheck the ground, all of them, as preventive. Battery, engine, engine strap.
And for the bonus, disconnect the courtesy light wire tripping the headlight switch which is a thermal fuse, it could be a short by a pinched dome light wire. So you have to find it.... or disconnect the fuse....
A short in one of the blinkers assembly can create all sorts of issues.... I ran without dash light for a long time...
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  #11  
Old 01-23-2012, 12:34 PM
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serehill serehill is offline
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This can be either the connectror or the switch.

Quote:
Originally Posted by Alleneoc
I have been looking in the the relays


Remove the switch & check the terminals on the switch. If they are burnt then the switch is damaged also. You need to press the terminal
connectors back together to create a tight fit. In other words take a small screwdriver & push on the clips to get them to fit tight again. The system is not the best design & doesn't carry current very well. This has caused some fires & fried wiring harnesses. Since it is not an overload or short the fuses won't blow & it will just fry the system because of loose connections. You probably will need a new headlight switch. The relays are highly recommended But make sure you get a good quality set. Most of the chinese untis are not good quality. The relay mod going around doesn't bypass the entire system Make sure if you do that mod you do the one that also bypasses the dimmer switch.
I bought a chinese relay system & fried 3 before I built my own HD system. I wound up stranded in the middle of nowhere with no Headlights & you can not buy parts. Buy a good relay when you do.
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If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 01-23-2012 at 12:50 PM.
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  #12  
Old 01-23-2012, 12:40 PM
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Quote:
Originally Posted by serehill
Remove the switch & check the terminals on the plugs. If they are burnt then the switch is damaged also. You need to press the terminal
connectors back togehter to create a tiight fit. The systeis not the best design & don't carry current very well. This has caused some fires & wire burn ups. You probably will need a new headlight switch. The relays are highly recommended But make sure you get a good quality set. Most of the chinese untis are not good quality. The relay mod going around don't bypass the entire system & impact the original wiring. Make sure if you do that mod you do one that also bypasses the dimmer switch.
I bougtht a chinese relay system & fried 3 before I built my own HD system.

how do you bypass the dimmer switch?
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  #13  
Old 01-23-2012, 12:51 PM
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sorry I had to do some rewritting

Quote:
Originally Posted by Alleneoc
how do you bypass the dimmer switch?

The right harness will do that for you. The link I've seen on here is labor intensive invasive & still does not bypass the dimmer & it can be a big problem too. The headlight & dimmer should control the relays.


http://www.ifsja.org/forums/vb/showthread.php?t=150172
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80 Cherokee
360 ci 727 with
Comp cams 270 h
NP208
Edlebrock performer intake
Holley 4180
Msd total multi spark.
4" rusty's springs
Member, FSJ Prissy Restoration Association

If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 05-07-2012 at 08:12 PM.
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  #14  
Old 01-23-2012, 01:16 PM
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serehill
i sent you a e-mail
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  #15  
Old 01-23-2012, 05:15 PM
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replied

Quote:
Originally Posted by Alleneoc
serehill
i sent you a e-mail

Done deal
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80 Cherokee
360 ci 727 with
Comp cams 270 h
NP208
Edlebrock performer intake
Holley 4180
Msd total multi spark.
4" rusty's springs
Member, FSJ Prissy Restoration Association

If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.
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  #16  
Old 01-30-2012, 09:18 AM
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new head light switch, new harness (thanks to Serehill), and new h4 headlight they work better than the light in my 01 GMC. thanks for all the info.

looking in to and Amp meter bypass now and making a harness for the off road light now.
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  #17  
Old 01-30-2012, 09:40 AM
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Allenoc

Quote:
Originally Posted by Alleneoc
new head light switch, new harness (thanks to Serehill), and new h4 headlight they work better than the light in my 01 GMC. thanks for all the info.

looking in to and Amp meter bypass now and making a harness for the off road light now.

YAY Good news.

The last switch you'll burn up.




When you get time give me a call there are some cool mods you can do to get the fogs going. The ammeter mod is just good sense.
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80 Cherokee
360 ci 727 with
Comp cams 270 h
NP208
Edlebrock performer intake
Holley 4180
Msd total multi spark.
4" rusty's springs
Member, FSJ Prissy Restoration Association

If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 01-30-2012 at 09:43 AM.
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  #18  
Old 05-07-2012, 06:41 PM
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Reading through the forums and I am having the same problem. I am relatively new to the FSJ world so bare with me.

I reached under the dash to touch the metal box that the pull switch goes into and it was very hot - could not keep my fingers on it.

Do I need to tighten the connections or replace that unit entirely? What is skill level/time to complete? Thank you!

-Rob
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  #19  
Old 05-07-2012, 08:15 PM
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Two things

replace the headlight switch
Relay the lights

http://www.ifsja.org/forums/vb/showthread.php?t=150172
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80 Cherokee
360 ci 727 with
Comp cams 270 h
NP208
Edlebrock performer intake
Holley 4180
Msd total multi spark.
4" rusty's springs
Member, FSJ Prissy Restoration Association

If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.
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  #20  
Old 05-07-2012, 11:26 PM
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Since it's all the lights and not just headlights, that rules out highbeam switch. If they are flickering fast it could be corroded headlight switch, missing ground wire from the battery (and/or motor) to the body OR a car-b-que about to happen due to the ammeter being corroded. My '83 Cherokee did that. Bypassed the ammeter and it went to normal.
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