Question about Isuzu Trooper

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1998 isuzu trooper 3.5L alternator gain control wire has ground KOEO ( alternator connector disconnected). Supposed to have battery voltage. Is this a bad PCM. Fuses are good. OCV battery is 11.9 and vehicle running I get 12.4 volts. the charging light is off but the alt is undercharging.

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  • derekadamz Sep 29, 2010

    how can I test the gain control circuit?

  • derekadamz Sep 29, 2010

    Also tried running vehicle with different battery, no effect. How do I confirm a bad PCM?

  • derekadamz Sep 29, 2010

    I have wiring diagrams from Mitchell and Alldata. The only spec. for the gain control wire is that I should have B+ on it KOEO. If you don't your supposed to check fuses. If the fuses are good, they ( Mitchell and Alldata) don't provide you with a solution. What should the gain control signal look like?

  • derekadamz Sep 29, 2010

    The only thing I need to know is how to confirm that the PCM is bad for not regulating the field circuit.

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I have a wiring diagram for you if you need it. It seems like it may be more simple. Email me at iambanshee74@yahoo.com and I will get this to you.

Posted on Sep 29, 2010

  • Kori Policy
    Kori Policy Sep 29, 2010

    Ok, so there will be the 100 amp under the hood, another 10 amp under the hood (ACG-S5), and one under the dash (meter 15 amp). Check all of those and if it only has 12.4 volts while running, it is not charging at all. You have a great battery though. Let me know.

  • Kori Policy
    Kori Policy Sep 29, 2010

    Apply a hot to the blue/white wire and with a volt meter, see if it is charging at that point.

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Hi! Yes this can be caused by a bad powertrain control module. YOu may need a replacement to resolve this.

Posted on Sep 29, 2010

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4 Answers

Already replaced new battery, new alternator, fuse, and pt connector - voltage sits at 12.9 running - system still not charging?


It isn't a good idea to disconnect the battery while it is running as the resulting voltage surge can damage electronics. Obviously if it isn't charging there won't be much of a surge...

Some alternators are mounted in rubber to cut noise and vibration. This type needs a ground wire which is sometimes forgotten during replacement and sometimes the ground wire just breaks.

A standard alternator only needs two or three wires and sometimes a ground wire. If the direct connection to the battery is good, the ignition light wire intact and working and if needed a battery sensing wire (though this wire isn't often needed in the last couple of decades) the alternator, if it is any good, will charge the battery at the regulated voltage of about 14.5.
If you are sure the alternator is a good one and it isn't charging the connecting wires must be at fault and need to be checked.

There is one other possibility and that applies only in the case of smart charging systems. If your car has a smart charging system the alternator will have several extra wires, usually plugged into the side of the machine.
The alternator works in a similar way to the standard unit except instruction from a separate control unit is capable of reducing or suspending charging. The smart charge black box talks with the engine management black box and charging is suspended during acceleration to cut fuel consumption or improve acceleration. A fault in the smart charge system can prevent the alternator charging.

Disconnecting the additional wiring will allow the alternator to perform its normal function without interruption. The ignition, charge or battery light is controlled by the black box and can do strange things that mean nothing when the smart charge is disconnected.

May 03, 2015 | 2002 Ford Escape

2 Answers

I have a 2012 Dodge Grand Caravan with the 3.6 pentastar. I have the battery light on on my dash and with my scan Guage connected to the obd2 connector inside the van it's showing 12.3 with the van...


Your charging system is not working correctly. Unlike most other vehicles, the alternator in yours does not have a built in regulator circuit. Some troubleshooting must be done to find the defective component. Most of this can be done with the vehicle still assembled.

First, check that you don't have a blown fusible link. In most newer cars, these will be in the underhood fuse panel, and look like giant fuses. If good, you will read very nearly zero volts and zero ohms when measuring between the positive battery terminal and the alternator output terminal. If either measurement doesn't read zero, find the loose connection, bad wire, or blown fusible link.

Next, check the ground connections to the engine, battery, and car body to make sure you don't have a bad wire or connection somewhere. Again, measure voltage and resistance between the negative battery terminal and all associated grounding locations. For a quickie test, you can rig a jumper cable between the battery negative terminal and the alternator case. If there is a spark when you make the connection, you have a bad ground somewhere.

If your battery is well connected to the alternator, the problem may lie in the control circuit. Most Chrysler alternators have two control wires that control the field coil. Some control the battery current and have constant ground supplied, and some have battery voltage applied and control the ground current. To test, disconnect the control connector and measure the voltage of both terminals with the ignition in the "off" and "run" positions. Make a chart of each terminal and its corresponding voltage.

Start the vehicle and measure both terminals again. If the terminals tend to be zero volts, except when the vehicle runs you have voltage on one terminal, you have a system where the computer controls battery voltage. If the terminals tend to be 12 volts when the ignition is on, then one terminal goes low when the engine runs, the computer controls ground current. If the voltages of one terminal change but not the other, this suggests a bad computer.

To do a go/no go test of the alternator unit, you can connect the control pins on the alternator with the control connector disconnected. Simply connect jumper wires to the two control terminals of the alternator. Connect one jumper to a known good ground, leaving the other jumper loose. Connect a voltmeter to the battery terminals or to the output wire on the alternator. Start the vehicle and briefly connect the second jumper wire to the positive battery terminal while watching the voltmeter. While the jumpers are both connected, the battery voltage should rise dramatically.If it doesn't, this suggests a bad alternator.

If all this sounds too complicated or dangerous, a good mechanic can perform a similar diagnosis in under an hour with definite results. Good luck.

Jan 04, 2015 | Cars & Trucks

2 Answers

1998 Isuzu trooper 3.5 alternator replace


step one remove battery neg lug .
the above video (of book?) is wrong.
the belt tension-ing step was skipped.

remove belt steps remove alt. wiring. remove alternator (bolts) it falls free. replace it , reverse steps above belt back tension belt. battery cable back. test run. charge/BAT lamp off?
see wrench below, turn it CW.
this releases the spring tension and belt comes off
to put back, do same and put on belt and release wrench.

25186758-dk3xh54xw1fmpqbxyhqoyzal-4-0.jpg3.5L only. USA only.

Oct 05, 2014 | Isuzu Trooper Cars & Trucks

1 Answer

1998 Isuzu Trooper won't charge battery. 3 alternators in the last year and a half and all get "burnt up" according to the mechanic. There is a 6 disc cd changer that doesnt work and makes odd noi


have you checked the wire that goes from alternator to the battery ,and see how many volts are going back to the battery. it maybe grounding off

Dec 14, 2012 | Isuzu Trooper Cars & Trucks

2 Answers

Won"t start..it was been a problem everytime since


any further symptoms and information would be handy

Jan 24, 2011 | 2002 Isuzu Trooper

1 Answer

Replace alternator


Alternator REMOVAL 3.2L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:
    • Negative battery cable
    • Front splash shield
    • Alternator drive belt
    • Adjuster
    • Top alternator bolt
    • Alternator wiring connectors
    • Alternator
3.5L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:
    • Negative battery cable
    • Accessory drive belt
    • Alternator wiring connectors
    • Alternator
INSTALLATION 3.2L Engine
  1. Install or connect the following:
    • Alternator
    • Alternator wiring connectors
    • Top alternator bolt
    • Adjuster
    • Alternator drive belt. Tighten the alternator top bolt to 16 ft. lbs. (22 Nm) and the adjuster lock bolt to 17 ft. lbs. (24 Nm).
    • Front splash shield
    • Negative battery cable
3.5L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Install or connect the following:
    • Alternator. Tighten the 10mm bolts to 30 ft. lbs. (41 Nm) and the 8mm bolts to 15 ft. lbs. (21 Nm).
    • Alternator wiring connectors
    • Accessory drive belt
    • Negative battery cable
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Jan 08, 2011 | 2000 Isuzu Trooper

3 Answers

1996 Isuzu Rodeo Voltage drops when vehicle accelerates. Have replaced the alternator w/o resolving the problem.


The usual cause for this to happen is either a loose or worn belt; or that the battery cables are dirty and need cleaned. To clean properly take the cables off and clean the ends and post with a wire brush or sand paper; then reattach and tighten.

Sep 11, 2010 | 1991 Isuzu Rodeo

1 Answer

1999 Isuzu Trooper Problem with Blower Motor, FUse Box, and exter


Did you find out a solution to your problem? I have a 1996 trooper that is showing most of the same symptoms that you have. I'm curious as to your fix. Was it simply a bad ground?

Apr 24, 2010 | 1999 Isuzu Trooper

2 Answers

Isuzu trooper overcharging (1996)


Make sure the ground wire going out of the voltage regulator is grounded and the alternator ground is good.Check all ground wires to there are the ones that stop the over charging.Theres also is a small little capacitor that should bolt right next to the regulator that holds alot of the over charging..

Mar 30, 2009 | 1996 Isuzu Trooper

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