Jeep charging troubles
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=199617
Printed Date: 15 May 2024 at 7:09am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Jeep charging troubles
Posted By: bobkyllo
Subject: Jeep charging troubles
Date Posted: 02 Feb 2024 at 8:30pm
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1996 jeep cherokee with the mighty straight 6. Customer said its not charging. Bring it in and confirmed. New alternator check my work looks great ship it out the door. A month later he is back. Now it charges 18 volts. Customer seems concerned. From the studying jeep decided to hide the regulator in the computer. I've looked the wiring all over very well. Took the battery temp sensor out of the battery box and warmed it up. Scan tool showed it reacted to temp change. Set the temp sensor off to the side. Still charging 18 volts. Battery tests good both with multi meter and a pile tester. Alternator is a month old. I'm thinking of condemning the computer. What kind of mess am I looking at there. Oh and where do I find a computer for a nearly 30 year old vehicle. I'm guessing my local napa or orielly won't have one handy. I'm guessing I'll have to program the computer too... I'm a bit over my wheel house here but I hate to say no and he's a good customer. |
Replies:
Posted By: Codger
Date Posted: 02 Feb 2024 at 8:52pm
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You are on the correct track with the ECM being the culprit. Your retail auto parts outlets will have them available without much problems. Have the last eight of the VIN with you when ordering. Chrysler used the ECM to control field excitation in the alternator for a lot of years and this Jeep is included in that scenario. ------------- A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now. |
Posted By: steve(ill)
Date Posted: 02 Feb 2024 at 9:55pm
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Probably not your problem, but 2 months ago i put a new battery in a 2019 FLEX.. It has a Negative battery clamp and 3 extra small wires like 16 gauge connected to little studs on the BIG CLAMP... I had to take the wires off to get extra movement of the clamp to get the battery out.. TIGHT AREA.... Apparently when i put the 3 little wires back on i forgot to tighten one little nut holding it to the stud... Week later had all kinds of funny electrical problems. Checked charging and i had 15.8 volts ... ...... Finally found it when i went to pull the battery back out..... Just saying, a bad GROUND for the ECM / computer could do the same thing. ... or possibly a plug on the alternator / bad ground reference..
------------- Like them all, but love the "B"s. |
Posted By: DMiller
Date Posted: 03 Feb 2024 at 1:58pm
| ALL manner of Electronics issues with bad or Loose connections. GREEN Connections at the ECM connector same issues. |
Posted By: bobkyllo
Date Posted: 03 Feb 2024 at 4:46pm
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I'm very hesitant to do the computer. I can't see anything else that's bad though. I wish there was a way I could rule the computer bad for sure. Possible the new alternator is bad? Could it have grounded it self some how? Any way to tell that? |
Posted By: steve(ill)
Date Posted: 03 Feb 2024 at 5:37pm
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If i had a 30 year old car with charging problems.. I Would get a SIMPLE alternator with internal regulator and wire it to the battery and let the Alternator figure out when to charge,,, NOT the computer.. ------------- Like them all, but love the "B"s. |
Posted By: jaybmiller
Date Posted: 03 Feb 2024 at 6:30pm
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https://www.wranglerforum.com/threads/alternator-voltage-to-high.1652129/" rel="nofollow - https://www.wranglerforum.com/threads/alternator-voltage-to-high.1652129/ check 'pongo's ' reply 3-4- down... googled 'jeep alternator 18 volts' to find this.... ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: DonBC
Date Posted: 03 Feb 2024 at 8:00pm
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I have an 89 Jeep Comanche pickup with ongoing electrical problems. The problem id with the fuse bock. A couple of the fuses have intermittent terminal connection problems. The fuse for the blower got hot due to poor connection and because of the power load it melted the fuse block in that area. The ignition fuse has intermittent problems which often ends with a dead or weak battery as the battery will stop charging if the fuse loses connection. ------------- Jack of all trades, master of none |
Posted By: Lars(wi)
Date Posted: 03 Feb 2024 at 11:54pm
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Is the alternator putting out 18 volts, or is the gauge showing 18 volts? Possible faulty gauge? ------------- I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science. |
Posted By: bobkyllo
Date Posted: 04 Feb 2024 at 2:27pm
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Alternator is putting out 18 volts yes. I verified that right away |
Posted By: Coke-in-MN
Date Posted: 04 Feb 2024 at 5:04pm
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Seems electrical problems are the new gold mine on repair - the throw parts at a problem until solution is found is Mfg idea of fix . Stop / Start light comes on on my 2015 Cherokee at odd times 20 miles of driving 5 miles next time , Light goes out when restarting only to show up again in xx miles . Asked dealer about it back when under warranty - said they checked - no problem they could see . Once out or warranty and asked again said $200 to $300 to fix IF it was ? Every once in a while if you energize it manually - a notice of LOW battery - charging , low voltage , not in service at present comes up in display . ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: DaveKamp
Date Posted: 07 Feb 2024 at 8:37pm
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I've had three Cherokee XJs. Never had a computer be the culprit. Always had ground wires be the culprit... Always the ground wires. Even if they LOOK good, bypass them with a jumper, and when your problem corrects itself, you found the bad wire. ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: Codger
Date Posted: 07 Feb 2024 at 11:27pm
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I've had two with bad ECM's. One in fairness had a charging problem but the a/c clutch was also controlled through the ECM and it too was non functioning unless the computer was bypassed. Both systems are cut out, or back upon acceleration to lessen parasitic drag on the engine such as for rapid passing another vehicle. Grounds and their respective terminations cannot be overemphasized or addressed too deeply. They are essential and marginal when the vehicles are built using the smallest gauge wire that will accomplish the task without any degradation which sets in with time and exposure. ------------- A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now. |
Posted By: NEVER green
Date Posted: 08 Feb 2024 at 9:09am
Interesting, I like to shut AC off for a big pass. ------------- 2-8050 1-7080 6080 D-19 modelE & A 7040 R50 |
Codger wrote: