Head lights

[Alleneoc]

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?

[GI-John]

I have the same problem. A little wiggle on the connector to the headlight switch fixes it every time.

[j20brett]

Bad connection at the headlights. Mine do it on occaision.

[mnewxcv]

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.

[mnewxcv]

Bad connection at the headlights. Mine do it on occaision.

but his affect all the lights not just headlights

[Alleneoc]

it will do it sitting still in the driveway

[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.

[Alleneoc]

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

[87Gray]

Possible body ground issue? Maybe the bolt is loose, or the ground wire is no good.

[letank]

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...

[serehill]

This can be either the connectror or the switch.

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.

[Alleneoc]

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?

[serehill]

sorry I had to do some rewritting

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

[Alleneoc]

serehill
i sent you a e-mail

[serehill]

replied

serehill
i sent you a e-mail

Done deal