Question about 1997 Dodge Caravan

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Alternator has high voltage and not chargeing battery

Is there possibly a fuse relay I am not seeing that goes to the alt. cause I can't seem to find anything between it and the PCM

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  • mnabi01
    mnabi01 May 11, 2010

    you mentioned that alternator over charging or not charging.?what do you mean but high voltage not charging?

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Look if You start the car and wile car running idling, disconnect the positive terminal on the battery and the engine stops, You need a New Alternator, look on the fuse box on the engine compartment for a fuse or a Relay with the alternator name, the main fuse is bolted to the fuse box, but I doubt is a fuse

Posted on Jan 21, 2009

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I replaced alt and it only charges at idle and not at all if headlights are on


You have replaced the alternator because? Did you check to see if it was any good before you replaced it? The charging rate is controlled by a regulator either in the alternator or in the ECM. The connections in the entire circuit have to be good. Check the grounds and connectors in the circuit. The condition of the battery is also important. If the battery doesn't have any capacity left the alternator wont get enough current flow through the field to power the alternator. You might need the services of a professional.

Mar 06, 2015 | 1995 Geo Tracker

1 Answer

Charging system voltage low


there are only 3 parts. but the causes are 25 or more.
1: belt missing slipping,
2: engine rpm below 800 RPM (lots of ways ,ask )
3: ALT had.
4: wiring to ALT bad.
5: bad battery or its connections, (wires)
6: bad fuse. see fuse link a11? on fFM page 20?
7: car is PCM alt controlled, it can be bad too. see 2 field wires on ALT and PCM on page 20? below?
8: battery temp sensor bad. making PCM think battery overheats.
the fSM covers all tests above.

pick car here, then pick charging.
5 alternators used on the 5 diffr.engines. got the wrong one?

the see wiring diagrams at end and chapter 20 inside, charge.
pdf page 118 for gas engine, if diesel next few.

Jan 07, 2014 | 1998 Jeep Cherokee

1 Answer

Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

1 Answer

Loss of power


stock car YJ ? , or all hacked up. (old cars get hacked)
2.5 or 4.0 liter engine? still have a real jeep alternator not upgraded?

loss of electrical power (first rule, we never need to guess.!!!)
not with a voltmeter. (tool that costs $20 )
alternator good (by what means, autozoned?) ( we can find out one car)
but low on gauge. what gauge in dash voltmeter.? sure...
i think you car has no charge lamp only the dash VM.

own an volt meter? a DMM? hand volt meter?

1: if the alternator charge lamp is stuck on driving.
2: is battery voltage at 13.3 to 15vdc with engine at 800 RPM idling
alternator belt not slipping, for sure.....???
if the battery voltage is near 12.5v and falling running that is
an Alternator system failure, note i said, system. !!!

this is first. if we get to here. we can find the real cause.
test 3:
is the charge lamp on keyon, and goes out running?
make sure the big fuse for the alternator in the engine bay fuse
box is not blown, 50amp?

I have no 95 FSM and my online source sucks for 95

Alternator dead: (alt good)
1: belt slipping . engine at 300rpm, nah.
2: fuse blown, the big one. (engine bay fuse box)
3: ;wrong alternator, there are many, most others will fail, even good ones.......
4: alternator ground bad. (end to end, to battery minus)
5: bad wiring to same. bad connections, any to battery or alt.
6: some jeeps the PCM has the field regulator, see link below.
ECU pin 20 , is field pin, it is on 95, 4.0L (engine not stated)

is the CEL lamp on, and throwing code 41 DTC?, alt, field errors?

the alt has 4 pins, battery, field,ground and voltage sense.
The reg is in the PCM. and if bad is a bad $3 transistor..
see same form for fix for that issue..

i think this is same as your. 1996 is big change year.
http://www.jeepforum.com/forum/f12/1993-wrangler-pcm-ecu-ecm-pin-out-diagram-1170004/


you can test the alt, PCM wire pulled !, by full fielding the alt.
grounding the field term, no wires on field pin of alt.
see FSM for details on that.
The PCM modulates the field pin to control charge at all times.

Dec 17, 2013 | 1995 Jeep Wrangler

1 Answer

2002 Ford Focus, driving down road, airbag light comes on, dashlights go out, engine runs rough then quits. Restarts, goes one block, quits again.


Symptoms of a charging system problem. The charging system comprises the alternator, battery and associated wiring. If the alternator should fail to produce a sufficient or stable enough voltage for the car's electronic systems - due to a wiring short, faulty voltage regulator, or corroded electrical connector, for example - the car will run off the "reserve" in the battery for a short time until the battery is eventually depleted. (The battery itself could also contribute to the problem if it has a faulty cell or for some reason is causing the alternator to put out an excessively high voltage in an attempt to compensate.)

So a couple of quick checks: Measure the battery voltage with the car off. Yours sounds like it will be dead; the clicking while attempting to start is the starter relay not getting enough juice. Then the question becomes: Is the battery dead because of age (fails to hold a charge) or because the alternator isn't charging it? To answer this question, measure the voltage at the battery with the car running. (Jump it or substitute a known good 12V battery.) You should see 14+V. If you only see 12V or less, you're seeing only the current battery charge without any contribution from the alt.

Finally, don't assume because the alt isn't putting out anything the alt is at fault. The wiring harness and electrical connector to the back of the alt should be thoroughly examined. (The wiring connector is a known failure point on early models.) The wiring harness should obviously show no signs of burning, melting or chafing and the battery terminals should be corrosion free and tight. If the harness checks out, remove the alt and have it bench tested. Rebuilding usually gives better long term reliability than chain store bought reman units, I'm told.

Long story short, I suspect the voltage regulator in your alternator failed, the battery gave it's all trying to keep your car running, finally gave up and now you have a dead alt and a dead battery. Don't just install a new battery without doing the alternator voltage output tests.

If you're really lucky it could be as simple as loose or corroded battery terminals.

Dec 31, 2012 | 2002 Ford Focus

2 Answers

2000 vw jetta alternator won't charge


the alternator gets power on big wire battery voltage the wire runs to starter, fuse box .alternator fuse goes to automatic shut down relay to relay control in ecm/pcm the field wire comes from ecm /pcm to alt.other field goes back to automatic shut down relay back to charge battery . if not charging at alt. try new alt. and retest.

Aug 05, 2012 | Cars & Trucks

1 Answer

2002 kia Rio Altenator not chargeing ( alt light not showing discharge ) Changed alt, Check out put with volt meter still putting out only 12.2 should be 13.8 Alt checked out OK on bench...


Hi, the actual output voltage produced by the alternator will vary depending on temperature and load, but will typically be about 1-1/2 to 2 volts higher than battery voltage. At idle, most charging systems will produce 13.8 to 15.3 volts with no lights or accessories on. This can be measured by connecting the positive (+) and negative (-) test leads of a voltmeter to the battery posts while the engine is running.

Possible cause of the alternator not charging includes Slipping or broken alternator belt, Open diode, Open circuit in stator windings, Open charging circuit, Open field circuit, Worn brushes or slip ring and Defective voltage regulator..

Feb 27, 2011 | Kia Rio Cars & Trucks

3 Answers

Battery is dead if it isn't started every hour.


Make sure he didn't put the wrong alternator in there. Sounds like it's charging too much, or shorting out somewhere. Take your starter in and have it checked.

Jun 29, 2009 | 1989 Pontiac Grand Prix

2 Answers

Dead battery. Alternator is charging, but the juice is not getting to battery. 1998 Slk 230. There is a relay p/n 002 542 20 19 05 3905 00, by the battery, (G) from the alternator has 19.8 volts, battery...


19.8 volts is too high. the alt regulator is not working. The regulator needs a battery source feed to work. Both the feed for the regulator and the connection between the output post and the positive battery terminal should go through an ALT fuse. Start by checking that.

Feb 28, 2009 | 1999 Mercedes-Benz M-Class

2 Answers

Charging system


howdie sounds like the alt,is at fault just check the plug at alt, and see if it is loose ,and see if you pull the positive post and see if its still run smooth l,m old school try it it don,t cause any problems you don,t leave it off to long see if it surges that's asigh that the alt, is goin they have abody controll module now a days that can go now nowadays rare though

Dec 29, 2008 | 2002 Mitsubishi Lancer

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