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Old 05-26-2011, 05:33 PM
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newbie

I just bought a 88 yj, the guy I bought it from drove it 15 miles to meet me then I drove it 15 miles to his house, then I made it 85 miles towards home at 65-75 mph when I smelt a burning smell for about 3 seconds then it shut down. after that when you turn the key you get nothing, no clicking, humming...NOHTINg!!!!
I'm assuming it burned a wire somewhere, im out of town till tomorrow just want to get some opinions on where to begin. Thanks for the help.


I hope my JEEP luck is better than my Z28 luck.....

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Old 05-26-2011, 05:35 PM   #2
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Welcome. And good luck.

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Old 05-26-2011, 05:37 PM   #3
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Geeze that sucks.... Welcome though
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Old 05-26-2011, 05:40 PM
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ya it does, I'm not familiar with this engine or electrical YET...any help would be much appreciated.
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Old 05-26-2011, 07:54 PM   #5
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sounds like a wire shorted and killed your ignition relay. not sure where it is on a jeep as I am new here as well. But I have had it happen on my mustang.
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Old 05-26-2011, 10:17 PM
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Ok, im a camaro guy, haha now we have some common ground. Thx for the input gotta find the relay and the bad wire/connection
Thanks
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Old 05-26-2011, 11:04 PM   #7
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Welcome! I would first check the main fuses, after that i would look at the electrical connectors, chop off the old ones and put new ones on. Clean the battery terminals and then check. Also if you take a voltmeter to the battery, whats the voltage indicate? is it above 11 volts? if yes then check the starter ground wire and ground wire around that area on the starter. thats an area on these that are prone to shorting issues. Also check around on the alternator connector. the above manuel i refrenced is a factory manuel and should come in handy when traceing the wires back.

https://docs.google.com/leaf?id=0B3Z...jODI4&hl=en_US
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Old 05-28-2011, 01:27 PM
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im hoping to have some time this weekend to check into it.
thanks for the help
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Old 06-05-2011, 12:29 PM
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I found that my jeep has no fuse box other than the one for the lights and acc, just relays under the hood. after I figured that out I started at the starter relay on the passenger side firewall and found that the wire for the ignition and fuel were not plugged in, also the ignition wire was burnt in half, after replacing these and plugging them in I am all good. she starts right up.
Thanks for the help
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Old 06-06-2011, 06:46 PM   #10
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Fantastic! Exactly the same thing that happened to my mustang. It even put a nifty black scorch mark on my optima red top.
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Old 06-12-2011, 04:48 PM
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well its been about a week, I have only driven the jeep maybe 100 miles, today I start smelling the burning again, pull over and the main harness that goes to the firewall on the driver side in the engine compartment is smoking BAD, a black wire was burning, after about 5-8 mins it stopped, WHAT THE HELL!!!!!!!!! I have a jeep that I think I can get the wire harness off of, but I dont want to replace it just to have this happen again, what should I do .......PLEASE HELP!
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Old 06-12-2011, 04:54 PM   #12
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First make sure that the PO didn't short a fuse. Check the fuse panels and make sure there are only fuses, not solid wire or paper clips shoved in there. Fuses are supposed to stop this kind of thing from happening. Next check the wire that burned (if you can) and see if it was cut or shorted. If you can find a cause of the fire, then you can replace the wiring harness and be confident it won't happen again.

Keep us posted.
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Old 06-12-2011, 05:05 PM
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thanks, I will be checking into it in the morning. this jeep only has the fuses under the dash for the lights and stuff there is no fuses under the hood just relays, would this make any difference???
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Old 06-29-2011, 12:20 PM
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Im being told that there is a way to fix the electrical problems with the earlier yj's by re-wiring the computer or something? Has anyone heard of this? I bought a complete harness (used) and am going to pull the interior and redo all the wiring, I just want to make sure I take care of ask the problems at once. Any suggestions?
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Old 06-29-2011, 01:13 PM   #15
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change all the fuses, and if you know anyone who has any type of electrical expertise bring them the old harness and let them look at it and see if their is a problem
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Old 07-10-2011, 01:27 PM
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Originally Posted by rmed4defense View Post
First make sure that the PO didn't short a fuse. Check the fuse panels and make sure there are only fuses, not solid wire or paper clips shoved in there. Fuses are supposed to stop this kind of thing from happening. Next check the wire that burned (if you can) and see if it was cut or shorted. If you can find a cause of the fire, then you can replace the wiring harness and be confident it won't happen again.

Keep us posted.
I've been out of town for a few weeks and finally got a chance to take out the dash and wiring, here are some pics of what I found.

1) the fuse block under dash (only one I have, 4.2l) has two blown fuses and one completely burnt fuse, Blue: Turn, Green: Dome, Yellow: Tail light

2) Fuse block

3) Engine compartment side of Fuse Block, Burnt bad (none of the wires from the fuse block to the other side of the firewall burnt, just the wires that dont pass through the fuse block and go into the firewall plug.

4) Wires that dont pass through the fuse block
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Old 07-10-2011, 01:53 PM
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cont.....

5) green or black Wire from the harness to the carb (i think its for the electric choke ( round thing in between the carb and valve cover???)) COMPLETELY BURNT. and was not connected, was laying on the exhaust manifold when I opened the hood.
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Old 07-10-2011, 02:03 PM
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cont....

6) Three wires going into the distributor cap, only one burnt, next pic is under the cap the two wires that are good are the two seen here the other stops at the rubber grommet and is completely burnt, next pic is the inside of the plug that these wires come from.
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Old 07-10-2011, 02:09 PM
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cont...

7) Next are the plugs that plug into the ignition switch just above the steering column the black plug/wires are completely burnt and the blue plug which goes right next to the black plug is fine. the top left prong on the ignition switch is burnt as well.

8) the only other wires burnt that I could find are on wire from the door switch that says weather the door is open or closed and one wire coming from the tail, this wire isnt burnt all the way back just until it enters the floor board.

I NEED TO GET MOVING ON THIS BUT DONT WANT TO PUT A NEW/USED HARNESS IN UNTIL I KNOW WHAT THE PROBLEM IS. please help....
THANKS
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Old 07-10-2011, 05:13 PM   #20
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Hmmm...overcharging alternator, or the wire resistance is too high would be my guess.
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Old 07-10-2011, 05:28 PM
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Hmmm...overcharging alternator, or the wire resistance is too high would be my guess.
can you elaborate on this? I am good with motors but dont know much with electrical.

none of the wires directly connected to the alternator are damaged.
(not sure if that makes a difference)

Thanks
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Old 07-10-2011, 06:00 PM   #22
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It's a wonder that you even got back home in it! Sounds to me like the wiring was old and frayed to the point that it was dangerous. Maybe there is nothing wrong with any main components like the alternator. When you replace the wiring harness you should have all new fuses and connections. Not telling you how to do anything, but I would get it all replaced and then have someone on hand (who knows electrical) when you hook the battery up and try to start it. If there is still a problem, there should be a blown fuse upcoming. Then you will know exactly where to channel your search. Good luck, and I'm sorry if I have suggested anything errantly.
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Old 07-10-2011, 06:18 PM   #23
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Basically I'll give you a quick run down of Ohms Laws and a crash course of electricity, basically the voltage regulator in your alternator could have failed and push too much through the system thus frying fuses and just about everything else. Although based on the photos, corrosion I would say is part of the culprit. One Ohm Law equation states V= Current (Amps) x Resistance. When your wires are dirty, corroded, not proper gauge your resistance increases. which creates a chain reaction in heat increasing, which in turn creates more resistance. Not saying that is entirely the problem, but perhaps could be part of the culprit. I'll probably confuse you on this.
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Old 07-10-2011, 10:29 PM
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Basically I'll give you a quick run down of Ohms Laws and a crash course of electricity, basically the voltage regulator in your alternator could have failed and push too much through the system thus frying fuses and just about everything else. Although based on the photos, corrosion I would say is part of the culprit. One Ohm Law equation states V= Current (Amps) x Resistance. When your wires are dirty, corroded, not proper gauge your resistance increases. which creates a chain reaction in heat increasing, which in turn creates more resistance. Not saying that is entirely the problem, but perhaps could be part of the culprit. I'll probably confuse you on this.
Not confused at all, very easy to understand the way you put it. At this point I'm going to go over the newly acquired used wire harness to check for corrosion and good connections, obviously I should replace the ignition switch and fuses/relays, any other suggestions..
Thanks for the help
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Old 07-11-2011, 04:19 PM
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Ok, I'm now getting a plan together... A friend of mine is an electrical guy he will be here friday to start replacing the entire harness from headlight to taillight, while I'm at it what else should I do, I am thinking the motorcraft carb and hei distributor, also I want to have the alternator checked out and im going to have the a/c installed. ANY SUGGESTIONS???
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Old 07-11-2011, 04:34 PM   #26
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AC!!! Isn't that where you open all your windows and drive fast?
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Old 07-11-2011, 04:35 PM   #27
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Seriously, it sounds to me like you have a great PLAN. Good luck with it.
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Old 07-11-2011, 04:40 PM
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Cool

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AC!!! Isn't that where you open all your windows and drive fast?
I'm in south florida, A/C is a must, A MUST, HAHA
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Old 07-11-2011, 04:41 PM
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Any suggestions are appreciated, thanx
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Old 07-11-2011, 05:06 PM   #30
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I had almost the same problem. I had mine for three weeks then I blew the ignition fusable link, replaced it. Drove fine then did it a week later, put in another fusable link to get it home. Then it died a third time I checked and the link was ok but the harness had burned an orange and red wire from the ignition switch from the steering column to the fusable link. Under the dash it only got those two wires. But under the hood it burned everything they were near.
I replaced the dash wires that were burned, the engine harness, the ignition switch on the column, and the thing on the firewall all the fusable links go to. None of the light harness was burned. I have put several miles, and lifted it since.

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