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In 1991 for the 1992 model year, Isuzu completely redesigned the Trooper to keep pace with changes in the SUV marketplace, making it larger, more powerful, and more luxurious.

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Possible alternator problems (No Mechanical Knowledge)

Ok, so i am making this post for my dads friend, as he is not the best with computers.

He recently bought a 93 Isuzu Trooper from a friend who was fed up trying to get it to work. What i have been told of the problem is that while the car runs fine and drives well, (both of them were really impressed with how it sounded and ran) the battery has died a few times while they were driving it. They replaced the alternator and some belts and the problem is still there. Additionally there are a few weird glitches with the interior electronics such as one of the turn signal lights not working the heat works does not work when the engine is on, and none of the interior lights work. I have pictures of the engine if that helps.

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Update (10/10/2020)

it's a 3.2l v6 1993 isuzu trooper is what im told

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Trap Velma what engine size is this Trooper? Main issue not charging even after replacing the alternator, correct?

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Hi,

Does the engine compartment fuse block cover have a legend inside detailing the function of the fuses and the relays?

I think that there is a "charge" relay located there so was wondering if it was OK or not.

Try the following test and if it fails the test AND there is a charge relay check if there is another similar relay (same specifications printed on the relay) in the fuse block that you can temporarily replace it with and check the voltage at the battery again. Switch the engine off when changing the relay.

If you have a DMM (digital multimeter) use its' Voltmeter function to test the voltage at the vehicle’s battery when the engine is running.

Park the vehicle and firmly apply the handbrake (emergency brake), ensure that the transmission is in Neutral (MT) or Park (AT) and switch off the engine.

Open the bonnet (hood) and then start the engine. Then connect the Voltmeter across the vehicle's battery terminals and measure the voltage.

IMPORTANT!

Be safety aware as the engine is running - watch where you place your hands etc and beware of any loose clothing, hair etc that may get caught in the moving parts of the engine.

With the engine running there should be 13.8V DC - 14.5V DC across the battery terminals. If there is <13.8V DC then as you have replaced the alternator it may be a faulty charge relay? (if there) or a faulty voltage regulator. I'm not sure if the regulator is a separately mounted component or whether it is integrated in with the alternator though

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Trap Velma besides all the great things that my colleague @jayeff is suggesting, you also want to check the 80A main fuse. If that fuse has blown the Trooper will not charge.

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I attached the charging system diagnostics from the SM so you can check it out

1993-Trooper-Charging-System.pdf

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