Alrighty fellas, all you electrical experts!!!!! Got a weird one for you. Gotta 88 YJ, I6, Manual Tranny.
MY problem is electrical in nature and the Hayes book does not cover this problem, so I am asking for help here. I am able to start the Jeep, no problem, turns right on over and runs well. While running with no lights on, the radio will go dead and then come back on. I traced every radio power related wire and found none of them to be loose and the in-line fuse is ok too.
While riding at night, the lights will do dim and then come back bright as normal a few seconds later. While this is dimming, the radio will go dead and also the two blinker indicator lights come on and stay on. I know this is probably fairly simple to find if I knew where to look.
My initial thought was also the alternator, but the radio/blinker light thing makes me lean towards a short. I'd think the best place to start looking is at your headlight/blinker harnesses up near the front of the vehicle.
Does this usually happen after hitting a bump, etc, or even on smooth road?
Similar thoughts as the others with altenator being the first thing I would have checked. Since it's free to get it checked most places I would do that either way, and also have you tried just idling your rig in the driveway and messing with the lights and such? If it's a steady time of happening versus randomly then it is probably not a short and something more serious.
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I have messed with the wiring in the driveway and have not come across a loose wire or ground for that measure. I do not have a owner's manual, but I got a Haynes Manual which lacks for clarity on this stuff.
I would agree sounds like a alternator,and or baterry cable issue. check to make sure you are getting a good 12 volt's to the alternator ("B" positive wire). If you are then check to make sure the alternator is putting out somwhere around 13 to 13.5 volts (this is your "A" positive wire). Refer to your manual. If this all checks out do the same thing with somone's help while one of you wiggles the wiring harnes around if there is a short this will help narrow down the location. They call it the "Ford wiggle test" Take your time and I am sure you can figure it out.goodluck.
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82' scrambler 350 TBI/700r4 D30/Currie 9"
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Swapped out an alternator and still doing the same thing. Checked my battery cables and it appears that all is tight and grounded there. Anybody got any other ideas because it's an electrical mystery to me now!
Check your grounds and If they have rust or lose clean them. Undue your battery and clean it too. If it is clean, well clean it again. Do it step and check. DO NOT DO THEM ALL AT ONCE. This will make it a uncontrolled test and you may never really find your issue.
I doubt it will be your alternator or anything like that. To me it sounds like the wiring. If your car has been exposed to a lot of heat, or ran real hot on a few occasions for whatever reason, the coating on the wires sometimes will melt and fuse with another wire. This can potentially cause cross voltage - sending the wrong amount of voltage to the wrong place - thus creating a surge of power on one thing, and a deficit of power on another.