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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?
    77 Cherokee 4 door 360 4" lift

    Fire Chief Allen FD
    Emergency Management Director
    former US Navy GSM ( gas turbine Mech.) 1982-1990

  • #2
    I have the same problem. A little wiggle on the connector to the headlight switch fixes it every time.
    Just Emptying Every Pocket

    Comment


    • #3
      Bad connection at the headlights. Mine do it on occaision.
      Kaiser - 1981 J20 115" WB - 5.3l/4l60E/np241c/3-link hp60 spooled/Leafs 14-bolt detroit/5.13's/40's

      Build Thread

      Fight Crime...Shoot Back.

      ΜΟΛΩΝ ΛΑΒΕ

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      • #4
        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.
        wanting my own FSJ

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        • #5
          Originally posted by j20brett
          Bad connection at the headlights. Mine do it on occaision.
          but his affect all the lights not just headlights
          wanting my own FSJ

          Comment


          • #6
            it will do it sitting still in the driveway
            77 Cherokee 4 door 360 4" lift

            Fire Chief Allen FD
            Emergency Management Director
            former US Navy GSM ( gas turbine Mech.) 1982-1990

            Comment


            • #7
              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.
              Lyle

              Seemed like a good idea at the time...
              69 1414x Wagoneer 350/TH400 DD & Ski Ride
              68 Chevelle wagon 350/BWT50
              68 Impala wagon 327/400
              73 Cougar droptop 351C/FMX Garage Queen
              04 Impala LS - Wife's DD
              73 Wagoneer parts donor

              Comment


              • #8
                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
                77 Cherokee 4 door 360 4" lift

                Fire Chief Allen FD
                Emergency Management Director
                former US Navy GSM ( gas turbine Mech.) 1982-1990

                Comment


                • #9
                  Possible body ground issue? Maybe the bolt is loose, or the ground wire is no good.

                  Comment


                  • #10
                    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...
                    Michel
                    74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
                    85 Gwag, 229 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

                    See Ouray 2013, Engine bits and Fuel and brake lines, and Body work

                    Comment


                    • #11
                      This can be either the connectror or the switch.

                      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.
                      Last edited by serehill; 01-23-2012, 12:50 PM.

                      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.

                      Comment


                      • #12
                        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?
                        77 Cherokee 4 door 360 4" lift

                        Fire Chief Allen FD
                        Emergency Management Director
                        former US Navy GSM ( gas turbine Mech.) 1982-1990

                        Comment


                        • #13
                          sorry I had to do some rewritting

                          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
                          Last edited by serehill; 05-07-2012, 08:12 PM.

                          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.

                          Comment


                          • #14
                            serehill
                            i sent you a e-mail
                            77 Cherokee 4 door 360 4" lift

                            Fire Chief Allen FD
                            Emergency Management Director
                            former US Navy GSM ( gas turbine Mech.) 1982-1990

                            Comment


                            • #15
                              replied

                              Originally posted by Alleneoc
                              serehill
                              i sent you a e-mail
                              Done deal

                              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.

                              Comment

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