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Old 05-01-2011, 12:55 AM   #1
Join Date: Apr 2011
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1993 Jeep Won't Keep a Charge

Wondering if someone has had this problem before. I have a 1993 Jeep Wrangler 4cy and the battery will not charge. I have replaced the Alternator, Battery, and have cleaned all connections. Still no luck with the problem. Any suggestions out there...Tks in advance

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Old 05-01-2011, 04:36 AM   #2
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check the fuses? i am pretty sure there is a fuse or a relay or both under the hood in the fuse box... that or your alternator was bad... and your replacement is a defect... i would check the fuses make sure they are good and getting power... if thats not it... i woudl maybe pull the new alternator off and get it tested or when its running hook up the multimeter to the battery should be like 14.4 volts...

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Old 05-01-2011, 10:14 AM   #3
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i agree check the underhood fuse block fuse.
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Old 05-02-2011, 01:40 AM   #4
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Thanks for the info. Had the alternator checked out and it is working fine. Also checked all the fuses and they are fine. 50 amp fuse is good. I did have a question regarding the relays. Is there one for the alternator? and if so where can i find it. ( might be my problem).....I have also read that it might be the ECM is there a way to check it before I spend the $ .... would it start if the ECM is bad???Tks again for the help
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Old 05-02-2011, 02:19 AM   #5
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There isn't an alternator relay. There is a Voltage regulator, but it is inside the Alternator and should have been checked when it was looked at.

There are two 50 A fuses, F2 and F6.
Make sure the Ground wire to the engine block is good.
The alt leads to the PCM at pins 57 and 20 directly. through some other things on other pins. 57 looks like it is a power wire for the PCM and 20 looks like it is the wire that would sense what the alt is doing.

Do you know it isn't charging because of reading it with a meter or using the meter on the dash? Did you check the fuses under the dash or just the ones in the engine compartment? The Dash meter reads through the inder dash fuse box, it also shares a line with the speedo, tach, Brake warning light, powers all the guages, but not their lights and also powers most of the dash idiot lights.
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Old 05-02-2011, 10:07 AM   #6
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yeah, Im curious, is it not charging? Or is there a short somewhere draining it fast? If you see higher than 12 on the guage, its charging just not keeping it.
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Old 05-03-2011, 12:35 AM   #7
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Thanks for the information...UNDEAD-89. So far I have checked both fuses and the fuses under the dash. Everything looked good. Just to give you more of an insight. Prior to the Battery not completely charging at all, the VOLTAGE Meter in the dash would show that the battery was not charging periodically. So it started working off and on. This is why I first believed the alternator was going out. This would be confirmed because my headlights would start to dim and it would drain until the battery would die. Then for some crazy reason the VOLTAGE Meter would show the battery start to charge again and the "Check Engine" light would go out and the headlights would show strong and bright. ( I also had the ck engine light checked by a Mechanic and the error was reading bad alternator or Voltage regulator going out) so i replaced the alternator even though i had the alternator checked out.( and it said it was good, But still replaced it). Now it will not charge at all....so i know i was on borrowed time.

That's were I'm at now..so my only option is to change the PCM? Right? I have done everything else and can't think of anything more. By the way I ordered one today for $125 should be here in about 2 days. i will keep you posted.I just can't think of anything else to check.

Just to answer SEVENSERVICES question. When the VOLTAGE Meter shows it is charging it will keep a charge without draining. And i had the battery replaced as well just to make sure. So i don't think its a bad battery ...Once charged i can drive it for awhile before it drains again.

So i will keep you posted on the out come....I'm headed out to the garage to clean and re-inspect the ground once again....so if you can think of anything else i would appreciate it.....Thanks again for the help guys....
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Old 05-03-2011, 12:51 AM   #8
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oh one more thing.....when it started to go out and would not charge periodically i would turn on the AC and it would spike it and start charging again...but now nothing works....so like i said, i was on borrowed time.
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Old 05-03-2011, 03:19 AM   #9
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it is starting to sound like you have a bad wire or Wiring harness somewhere between the battery and Alt or even the ground wiring. I double check all connections on those and look at the wires and see if there is any damage. Flex the wires near the connections and make sure the insulation isn't the only thing holding the wire together.

I would also double check the Belts. If you have a serpentine I would check the tensioner and make sure it isn't letting the belt loosen up and slip. it could be when you kicked on the AC it put an extra load on the belt giving it enough tension to tighten on the Alt.
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Old 05-11-2011, 06:53 PM   #10
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Problem located

Ok after a long trouble shooting session I found the problem. I replaced the PCM, ECM, and the old one was bad...Everything working perfect now....Tks for all the help guys...part came in and running like a champ.

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