Question about 2002 Jeep Grand Cherokee

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I put a new alternator/battery in my 02 jeep grand cherokee limtid and now my batttery gauge keeps moveing back and forth . whats causeing this?

It drove fine for bout a month and now my batttery gauge keeps moveing back and forth and just had the new alternator tested and it tested fin and all the fuses and wireing looks to be ok also.. whats causeing this?

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  • Jeep Master
  • 20,706 Answers

What engine option????????????????????????????
that dash meter is a volt meter.
so when that meter varies
connect any hand meter, DMM (volts) to the battery lugs
do both meters vary,?,, yes, BINGO its not fibbing to you, the
voltage is out of control. per below:
but key on volts is 12.6v
and running does vary from 13.3 to 15v, this is NORMAL
outside that range is AB-NORMAL.(running)

post actual accurate voltages. and we cant find true cause.
is engine RPM always above 800 rpm
is the alternator fan belt at spec, tension?

if engine RPM drops , way low the ALT drops.
if the belt slips ,same deal.
My 4.0L uses a serpentine belt that must be set real tight.
100lbs. in fact. i have a spec tool to do that. (guessing dont work)
tell engine on 02 GC and we can look it up.


Posted on Apr 02, 2014

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Posted on Jan 02, 2017

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  • 6982 Answers

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: put a new alternator in 2000 Jeep Grand Cherokee engine light on

Ive had this similar problem in the past with my 2000 Grand Jeep Cherokee. Ive found by putting the Jeep in neutral ...it started right away. Good luck

Posted on Apr 08, 2009

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SOURCE: my 95 grand cherokee starts fine but isnt charging

Pretty sure the regulator on those is in the computer (I know...really dumb...) There is a way to wire around it using an older style regulator but it will keep the check engine light on and may not pass inspection like that.

Posted on Jul 07, 2009

  • 6982 Answers

SOURCE: 2004 jeep grand cherokee will not start, dash

It takes very little voltage and amperage to operate dash gauges. You cannot rely on "seems" when it comes to the battery. A good battery should have standing voltage of at least 12v and be able to "snap back" from a fifteen second 200 amp load. Under load, the voltage should not drop lower than 9.5 volts. Have the battery charged and load tested before going anywhere else with this. then make sure connections are clean and tight. After you get it started, if battery was good, check starter draw and charging system operation. If it does not start, check power flow from key through neutral safety switch and starter relay to starter.

Posted on Sep 06, 2009

Testimonial: "very helpful , battery was no good , installed new battery. problem solved"

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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.

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move the steering wheel back and forth and rattle the key with pliers back and forth you may get one more start out of it . Then get it to a shop for a lock cylinder
Good Luck
TEETERMAN

Aug 13, 2008 | 2002 Jeep Grand Cherokee

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