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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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

Does a 1998 Isuzu Trooper alternator charge through the PCM to the battery?


No. In every charging system I have seen the alternator output is direct to the battery, however the control that regulates the alternator output can be performed in variety of ways.

You need to check the wiring diagram to discover how yours is controlled.

Most alternators since the late 1970's are self contained generators but there are recent developments such as smart charge systems that feature a certain amount of computer interference.

A rough idea of the system can be formed by the number of connections to the alternator. A "normal" machine-sensed setup requires only two wires - the output connection and a thin cable from the ignition/charging/battery light, though an alternator mounted in rubber bushes will also require a heavy ground bonding cable.

A few early setups also needed a ground cable.

Dec 28, 2017 | 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

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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..

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

Mar 30, 2009 | 1996 Isuzu Trooper

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