Question about 1995 Jeep Grand Cherokee

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95 jeep grand cherokee. Alternator charges intermittently only after engine squeals, belt NOT loose.

Upon start the alternator in my 95 jeep grand wont charge (6 cylinder), the voltage gauge stays around 10 volts. after it runs for a while the engine squeals and the alt starts charging. the belt IS NOT loose. I had the alternator tested and it passed. I cant pin down where the squealing is coming from. Someone told me that any bad pulley in the belt system can cause a lag in the belt and make the alternator fail to charge. I also found some fourms that suggest that a bad ecu could be the cause. I cant afford to replace all of the pumps, pulleys and ecu. Any one have any ideas?

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  • Jeep Master
  • 20,706 Answers

If the belt squeals why not fix that first? ?>?????
that is correct, if a shared belt resource, is seized it will cause any belt to slip and the alternator to stall , after all they are SHARED.
some alternators do have the regulator in the ECU. for sure.
why guess, tools are cheap. wana buy a tool.>
did you hand spin all shared pulleys to feel for seizer or use a $5
stethoscope on each for load bearing noise, so simple to do...
they sell this tool called a Laser RPM tool, point and shoot.
its cheap,
The correct RPM of the ALT is publised in the FSM and you can measure it.
i take my crank pulley diameter and divide it by the alt pulley diameter.
eg: one is 8" other is 3"
so the ratio is 2.66 :1
so at engine RPM of 800 x 2.66 you have 2128 rpm on the alt.
basic mech, 101.
so if the tool shows way less than that, then bingo, the pulley is slipping, BTW2 not all slips squeal. so.... the tools rule the world of mechanics.
here is the cheap tool i use to find things with wrong RPM.
i put a dab of liquid paper (walfart) on any pulley and this tool
picks it up and bam RPM exactly.
no hands getting caught in belts etc, no danger.

so recap
belt new.
all things on the belt, feel good spun
all things on that belt , sound good $5 stethoscope.
tension on belt , at spec.
if still bad out comes Mr
DT22334A
http://www.amazon.com/DT2234A-Tachometer-chemical-automobile-airplane/dp/B00BKUNOAW

in the real world , sometimes THINGs only SEIZE on the fly.
picture in mind a dry bearing that keeps dragging more as it spins faster. bingo. its bad. and gets worse at higher RPM and soon it
will seize 100% and throw that belt or shred it.

I cant pin down where it squeels
why not drop the belt (cold engine if shared with water pump)
and now it dont squeal.
easy huh, no belt , no squeal.
i truly hope this helps.
there is no reason to guess, besides a new unglazed belt.
ever.

Posted on Mar 18, 2014

  • 2 more comments 
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    _-__-___-_ Mar 18, 2014

    rule 1, correct rpm. if correct then worry ECU.not first EVER. my guess I6 4.0L:engine. next is the real schematic of a real GC and how it works the FSM does that, ever heard of FSM,? here it is for free, now click charging and what do you see.? did you check for DTC errors? flash codes , ? and this ALT 90/120 options IS PCM controled. but dont worry that until RPM is good, and no DTCs set, ever.

  • _-__-___-_
    _-__-___-_ Mar 18, 2014

    http: //w w w.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

  • _-__-___-_
    _-__-___-_ Mar 18, 2014

    remove 3 spaces to see full FSM. see wiring 8w-20 chapter for PCM wiring to ALt.

  • _-__-___-_
    _-__-___-_ Mar 18, 2014

    ENGINE rpm AT SPEC. NOT 400. ALT RPM AT SPEC. , THEN GOOD BATTERY, IF THAT is good, then if voltmeter is not at 13.3 to 15v then the ALT is bad or shut down. Alts can shut down for many a reason. we can work that after the squeal is fixed.

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Posted on Jan 02, 2017

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  • 6982 Answers

SOURCE: Loud squealing sound in my engine

Try removing the belt and turning each pulley by hand. If everything is smooth and free, with the belt still off, drive down the block once and see if the noise is there (this will eliminate all rotating accessories on the front). If you hear the noise, then there is a problem deeper inside. Oil pressure is good? Dont' forget when doing this, you will have no power steering, so be careful.

Posted on Jan 17, 2009

  • 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

  • 1779 Answers

SOURCE: Intermitent problem with alternator not charging. 1998 Cherokee 6

2 possibilities, a bad wire somewhere (a break in wire) that's causing this, or a defective gauge. How often does it go to 0 volts? If you put a load on system when it drops to 0 volts (lights on, a/c on, hit the horn) does everything seem normal? If it does, it must be a bad gauge.

Posted on Mar 19, 2009

BCAS1298
  • 3092 Answers

SOURCE: 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.

Posted on Dec 08, 2009

  • 6982 Answers

SOURCE: 1998 Jeep Grand Cherokee Power Steering Pump/Pulley/Belt

I see this is a two part question...
In replacing the alternator, there is no reason at all to be messing with the pulley on the power steering. That pulley is pressed on and though you could remove it with a puller it is far more difficult to re-install without the proper tools. (it is not hammered on). Power steering pulleys don't just fall off. They are so tightly pressed onto the shaft that they don't even require a retaining bolt to hold them on.
Without the benefit of being able to examine it myself, I'd have to guess that either you originally had a mis-match of pulley to pulley shaft and the pulley was sliding on the shaft (so remote a concept that you may be hit by a meteorite if you buy that) Or someone removed it for an unknown reason and did not properly re-install it.

Posted on Feb 01, 2010

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