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Old 07-09-2011, 07:38 PM   #1
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Default 96 Cherokee electrical problem

Ok so i have a 96 cherokee with the 4.0 in it, everything was working and running fine until i broke the track bar drop mount. so i have been waiting for my ne adj track bar to come in. It finally came in july 6th so i put it on the jeep and take off down the road, stop at a gas station to fill up and as i am leaving the engine stalls, yay me so i get a jump and everything is running fine for about 2 miles then i can tell the head lights are dimming, the "gen" light is on by now and i notice i am loosing power WTF i think so i pull over and get my friend to jump me a couple times to get it to his house. Since the "gen" light was on i figured it was the alt so the next day i took it out and take it to NAPA and have them test it.... test comes back fine the alt is good so i come back and reinstall it but this time i checked online and found out that grounds can be a main cause of charging system problems so i take off and clean the gounds at the following locations: the quarter panel right next to the batt, the ground going from the firewall to the head (which i took off and moved to another bolt cause the on in the back is a pain to get to), both ground that are hooked to the engine block right behind the alternator and also i ran a new ground from the top mounting bolt to the neg on the batt just for good measure. I hook everything back up and i am praying at this point that it works, i go and start the jeep and everything seems fine but after about 30-60sec the damn "gen" light comes back on and the volt gauge is hovering around 10-11volts, so i turn the headlights on and and sit and wait, and i watch the volt gauge start dropping. Now i have ran out of options and dont know what to do PLEASE PLEASE PLEASE SOMEONE HELP ME!!!!!! i refuse to take it to a shop and pay for **** that doesnt need to be fixed. thanks in advance
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Old 07-09-2011, 07:52 PM   #2
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Default 2nd opinion? batt tested OK?

I dunno man, that really sounds like an alternator to me, but did you also have your battery tested? Maybe it just won't hold a charge? Also, mebbe check the wires from Alt to Batt for continuity/corrosion?

The grounds on my 96 were crap when I looked at them last fall so it probably was a good thing you did those anyway!
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Old 07-10-2011, 12:07 AM   #3
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Yeah that's what im thinking.... I am getting a new alt in the morning and I am also investing in a voltimeter... I defied to do the pos. Batt test where u start the jeep and disconnect the pos batt terminal and from what im told if the vehicle stays running then the alt is fine well mine shut down immediately so I figure I will try a $100 alt why not right lol... im also thinking about picking up a batt. Charging relay im thinking maybe that might be bad as well


Don't really know what else to do so im trying to go through the whole charging system... also picking up some 8ga cable so I can rerun the wired need be I will def let everyone know how it turns out
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Old 07-10-2011, 03:30 AM   #4
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So check it out. I just fixed a Toyota where he alternator was charging and the test would say it was good but the internal were grounding to the case. Just for fun you could take a multimeter and check for continuity between one of the bolts holding the.alternator together or he mounting point and the power post and see if there's a circuit. Just cause he alternator is charging and the little test by do checks out doesn't mean its good. I've gone through two alternator (likes rivers, thank goodness for oreilly lifetime warranty) and the second one was still charging.... somewhat intermittently. Bets on he alternator
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Old 07-10-2011, 06:56 AM   #5
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Definitely, buy a multi meter. Digital MMs are really inexpensive these days and make troubleshooting soooooo much easier.
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Old 07-10-2011, 05:28 PM   #6
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Ok so I replaced the alt... not the problem so I took the charging harness apart to lack sure no wires were broke... everything was fine, but I replaced the power wire going to the circut box under the hood and reattached everything, didn't fix the problem either.... so I found two ground up by my ecm and cleaned those.. but also the middle plug in my ecm the wires were cut and reattached so I took them apart and twisted them together ( don't have any connecters at the moment so I used electrical tape and twisted the wires together and then started and I got a good 14v charge now...so I left and started drivng down the road and now there's a prob with the engine it idles ok untill it warms up and then kinda floats from 600-1100rpms over and over untill I step on it now it bucks, backfires and botha down bad and I can't get it to run even close to stright unless I step on it and make it run at 2500-3000rpms and then it shifts and goes back to backfiring and bogging down.. its got new plugs and wires but im thinking its either the plug going to the ecm or the throttle position sensor.... so far 4 days about 8hrs each day and around 300$ in parts and sensors and still running rough
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Old 07-11-2011, 12:51 PM   #7
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Quote:
Originally Posted by excess650
Definitely, buy a multi meter. Digital MMs are really inexpensive these days and make troubleshooting soooooo much easier.
I did buy one and I feel like a total noon right now buy I read the directions and still can figure out what setting it goes on for what your testing lol
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Old 07-11-2011, 02:37 PM   #8
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Voltage you put it on 20dc and male sure the wires are plugged in usually to the bottom hole and next one up. Continuity looks something like this +>l.... amps is special and you prob don't need it.
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Old 07-11-2011, 05:17 PM   #9
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OEM charging system, OEM tech.

Moved.
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