93 4.0l ZJ Alternator Test good but won't charge! - JeepForum.com
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Unread 09-01-2008, 07:30 AM   #1
nkropelnicki
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1993 ZJ 
 
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93 4.0l ZJ Alternator Test good but won't charge!

I'm a newbie to Jeeps, just bought mine a couple weeks ago, however for some reason, the alternator isn't charging the battery! pulled the alternator, & tested out @ 60 amps, so i know it puts out. I had corrosion, so i changed the cables out, & i checked the fuses & the ground connection as well as the belt tension and everything checked out fine. A couple times, i could turn on the a/c & the voltmeter would jump from my 9 volts to 14 instantly, but now it won't even go to 12 volts, even @ 2,500rpm. I've looked on the forums & found something in relation to the regulator in the ECU, but after a reset, i still cannot find the source of the problem! Can someone help me so i don't have to continue driving my wife's (Pink) car to work???

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Unread 09-01-2008, 09:13 AM   #2
sandman
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do you have a good ground?
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Unread 09-01-2008, 02:23 PM   #3
nkropelnicki
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Of course i do, i only drive on pavement until i get good at working on them.

I am SO kidding.


"...i checked the fuses & the ground connection as well as the belt tension and everything checked out fine."
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Unread 09-01-2008, 03:07 PM   #4
mopar3389
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get the battery tested. seems too simple but I've seen the same thing happen a few times before. If it's good, you might have an issue with the battery losing power some other way, but I'd need more detail on that to help you.
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Unread 09-01-2008, 04:17 PM   #5
nkropelnicki
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Yeah it's a brand new battery, & i had it tested also, & they said it's good.
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Unread 09-02-2008, 08:28 AM   #6
jeepinjoe123
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i know u said u checked the fuses but change the two generator output fuses in the engine bay fusebox fixed my problem
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Unread 09-02-2008, 05:54 PM   #7
nkropelnicki
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the two 60's, correct?
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Unread 09-07-2008, 02:37 PM   #8
jeepinjoe123
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yes sir
i changed those two and my problem was gona both times
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Unread 09-07-2008, 07:22 PM   #9
jabsther
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I had a problem with my 94 ZJ. Had battery tested, they said it was good. Tested alternator, tested good but changed anywas since they said the battery passed load test. Ended up being battery all along, couldn't even jump start with cables.
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Unread 09-10-2008, 06:16 PM   #10
nkropelnicki
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The battery is brand new, & It runs fine on a full charge... until the battery dies. I pulled the alternator out (PITA!!!) & it tested good @ autozone.

They suggested that I need to replace the ECM due to a faulty voltage regulator, but i've read on different forums that have said some alternators have built in regulators... So on my 93 ZJ 4.0l, is the regulator on that little wiring harness that connects to the alternator, or am i truly screwed?

Battery - ok
wiring - clean, no corrosino
ground - good,
belt tension, good
fuses & relays are good
alternator - good

and if it is on the ECM, can i just rig a voltage regulator on the output, & go straight to the battery?
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Unread 09-10-2008, 06:23 PM   #11
nkropelnicki
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I also did a close circuit test, where you check to make sure there is no power going anywhere while it's off, I pulled the fuse on the IOD, & disconnected the positive cable & connected the ground of a test light to the battery & connected the probe to the cable, & verified there are no open circuits, unless IOD is plugged in.
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Unread 10-28-2008, 04:42 PM   #12
1989Cherokee
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First off, sorry to revive an old post.

nkropelnicki, did you ever find a definitive answer as to what was causing your alternator problems and did you get it fixed? I'm only wondering because I also have a '93 ZJ 4.0 and am having the same problem, when I start the jeep the alternator gauge will not go up, it stays in the red area. Then, after a while of driving it finally goes up and charges at about 14. I have also checked my grounds and had my alternator tested and it passed with flying colors. Thanks for any help, and sorry again about reviving the old post.
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Unread 10-29-2008, 05:11 AM   #13
nkropelnicki
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Yeah it seems temperature related, because when it get's cold, it charges great & once it gets hot, it doesn't work so well, so i'm suspecting that maybe the coil doesn't make great contact when warm.. phantom prob i think on my end.
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Unread 10-29-2008, 04:04 PM   #14
1989Cherokee
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Quote:
Originally Posted by nkropelnicki View Post
Yeah it seems temperature related, because when it get's cold, it charges great & once it gets hot, it doesn't work so well, so i'm suspecting that maybe the coil doesn't make great contact when warm.. phantom prob i think on my end.
mine seems like it could be temperature related like you say because now that the weather is cold, I am having this problem almost everyday, where as when the weather was warm, it would only happen on rare occasions, I hope this doesn't turn out to be one of those phantom electric problems
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Unread 10-29-2008, 04:43 PM   #15
stockline19
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if you think its temp. related try going out in the cold (when the problem is happening) and take a heat gun (gently, dont melt anything or burn anything up) start warming up your components until the symptoms are gone, start with the alternator and pcm and work your way around fuses and modules and all that good stuff, see if anything works for you
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