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I have a 2002 jeep grand Cherokee 4.7 v8 4x4 I was driving and notice my voltage meter was dropping made it home checked the battery after charging tested fine, voltage again dropped while driving, had the alternator tested it tested fine..... Any ideas maybe a voltage regulator one mechanic said the pcm he wants 500+ to fix it. Need another option can't afford that one any suggestions.

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How did you have the alternator checked? bench tested? check the charging system at the battery with a volt meter while the car is running to see what the voltage is it should be above 13 volts but less then 15 volts if not clean all connections and check all the fuses there is a fuse under the dash that may have blown. If this don't work check with a jeep dealership

Posted on Jan 12, 2013


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Posted on Jan 02, 2017

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SOURCE: 2002 Dodge Ram 1500 ,4.7L V-8 Battery is not CHarging

A lot of Chrysler products have the voltage regulator in the computer. I would check the charging system wiring first for poor connections and if nothing else is found there is nothing else for you to do but change it.

Posted on Dec 09, 2008

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SOURCE: 1996 Jeep Grand Cherokee intermittent voltage drop, lose electric

I wont list this as a solution, but it seems that working in the area of the alt may have moved around some wiring...the alt may be OK but perhaps an adjacent wire (maybe a ground) is not well connected. Also check crimped on wire loops on alt connectors..they like to corrode at the crimp where it crushes on the actual wire.

Posted on Feb 19, 2009

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SOURCE: Battery won't stay charged while running. Alternator is fine tho.

It seems that your battery is not getting its charging amount from the rectifier which comes from the dynamo when the engine is in running condition. So just your rectifier and check the output of the dynamo to be sure thats OK............sodeep

Posted on May 21, 2009

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SOURCE: my 1998 jeep grand cherokee isint charging, ive

On the terminal maked"l" you need to put switched power from the ignition[ the problem], will go away.If this is not an option then you can get an alternator repair shop to put a self exciting regulater and it will kick in with a quick rev of the engine,no wireing required

Posted on Dec 08, 2009

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I have a 1995 Jeep Grand Cherokee with a 4 month old battery.A couple of the power door locks quit working a while back and my husband went out a couple of days ago and sprayed them with WD 40 but they...

check the voltage on the battery with a volt meter, it should be around 12.6 to 13 volts, if not charge battery with a charger, after charge try to start vehicle, if the vehicle starts use your volt meter at the battery again, the voltage should be around 14 to 14.5 any lower and the battery isn't being charged and the alternator should be checked and or replaced to solve the problem..

Feb 28, 2011 | 1995 Jeep Grand Cherokee

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Jeep totally lost power. Don't think battery went bad that fast. Jeep has no power what's-so-ever

Begin by checking voltage (with a volt meter) at the battery terminals (part of the battery not the connectors). Voltage should read somewhere around 12volts (a volt above or slightly less is OK, but not lower than 11.9) Then move the positive probe to the connector and check, again, move the negative probe to the connector. Leave the probe at the positive terminal and check voltage between the block and the battery by touching the negative probe to any metal part of the block. Continue working your way down the harness on the positive side, checking volts at the power distribution center, fuses and at the main battery connection on the starter. As you get further from the battery the voltage will be slighty less but you should not see a radical drop. If you find a large drop or no volts at all where you'd expect to have a reading, stop there and find the cause.
Chances are the connections on the battery are bad and you won't have to look further than that.
If battery is not at the proper voltage, re charge it and then put the meter on both terminals and check running voltage. It should be at least 12.9 to 14 volts running and should not drop below 12.5 with all accessories on including the lights. If it does, check the alternator and drive belt.

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I recently replaced my battery in my 2000 jeep grand cherokee, but when I go to turn the key, it makes a clicking noise and won't start. What do I need to do.

sounds like a starter issue need to replace starter but before you replace startes check all wires from battery to make sure they are clean you can have the starter checked after you have it out at the parts store

Mar 03, 2010 | 2000 Jeep Grand Cherokee

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I have a 1995 Jeep Grand Cherokee and have a

Look's like you done every thing that need's to check, just make sure your belt is adj' right, cause an alternator under a load will drag so make sure it's tie.Good luck and x-mas.

Dec 08, 2009 | 1995 Jeep Grand Cherokee

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Electric problem on 2002 Jeep cherokee 6

I had a similar problem, Mine turned out to be a weak cell in the battery. Here is what I did to find it. First, check what postion is the dome light switch in when this problem happens?

Disconect the negitive battery terminal. connect a volt, ohm, amp, meter in series between the negative battery terminal, and the disconected negative battery cable. How much voltage is showing on the meter? open the door does the voltage go up, or does it drop off?
Close the door wait 30, 40 second voltage should start to decrease back down to 0. This is normal the dome light uses a module to control the dome light delay.
If the voltage does not drop down to zero with the door closed after a min. or 2, select the amp setting in your meter, read the amperage draw. This is what drains the battery, the higher the amperage reading the quicker the battery will drain.
With the meter still hooked up remove one fuse at a time, when the amperage drops off you have found the defective circuit.

Apr 15, 2009 | 2002 Jeep Grand Cherokee

1 Answer

New alternator (actually 2 new) no charge

Find a friend with a heated garage that you can use first off, then locate the short that may be causing all this. Unless you have a bad battery? If its more than 3 years old, replace it. Batterys are cheap. WALMART has em under 89 bucks for most vehicles.

Dec 20, 2008 | 2004 Jeep Grand Cherokee

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Alternator or Voltage regulator?

Hello, with much satisfaction as of now, I am happy to say I have fixed this problem yesterday. I did so by continuing to read through these message boards, put certain ideas together and figure it out. We all know by now Jeep has ridiculous flaws, how a recall was never ordered, we may never know.
In any case, Jeep has a defective internal Security System. Once malfunctions begin to occur, it is all down hill from there. It cause Battery drainage even after changing battery. Simply remove the fuses for the security system. They are located on the pasanger side, on the right hand side of glove box there is a panel, remove it and find fuses # 6 and # 7. Take them out and Problem is solved.
I have tried everything from the wiring in door panel, wiring in foot panel and everything else that was suggested, It all finally came to an end one the fuses were removed. Good Luck and I hope this helps

Aug 10, 2008 | 1993 Jeep Grand Cherokee

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