Question about 1999 Isuzu Trooper

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

1999 Isuzu Trooper:
Symptoms, multiple:
Blower Motor Not Working
Alternator Not Working
Instrument Panel ABS Light Is On
Instrument Panel Battery Light Is On
Blower Motor:
Turn on switch to blower: No Blower
Tested Fuse: Good
Jumper Fuse: No Blower Motor
Jumper to blower motor from another fuse, Blower Motor works fine.
Fuse Box, Inside Trooper:
Pull internal fuse box from panel and test power to each fuse from the back side of the fuse box.
All power wires on back side of fuse box show power except:
Blower Motor Fuse and AC Fuse next to blower motor fuse.
I cannot visibly follow blower motor power in wire from fuse box up through wire harness to behind the dash board to the fuse box under hood beside battery.
I am curious about the AC Comp Relay in the External Fuse Box.
I have not spotted the blower resistor that is supposed to be beside the external fuse box, but that is from a Rodeo manual.

Alternator and Battery:
Alternator is not producing DC output to battery. Simple test on battery before cranking engine and after cranking engine. I have not pulled alternator but really do not believe alternator is bad at this point.

I tried to source a Trooper manual from each of three auto stores in town and found only a Harris manual for the Rodeo and Amigo. I bought that manual.

Electrical schematics are not that good.

Posted by on

  • gajunebug55 Apr 26, 2010

    I have the alternator off. I bought it at AutoZone in July 2008. It has a life time warranty. Sunday they ordered a replacement to arrive today.

    My big screw up so far, when spotting the bolt to remove at the bottom of the alternator, I could not see well because of position. By mistake I removed the two bolts that hold the alternator bracket in place instead of the last bolt holding the alternator. Caused a big problem removing the alternator from the hole.

    Tonight I am going to ask someone to go under the Trooper and spot for me. I tried for 15 minutes last night to get the bolts back into the holes and mount the bracket but I am just not double jointed to an extreme.

    Otherwise I owuld have the alternator on in 45 minutes and know if my problem is fixed.

  • Bruce Augustine Apr 15, 2017

    As far as the blower motor is concerned behind the glove box there is a blower motor resistor they usually blow 1 speed at a time from low to full, the part is not expensive usually $25 dollars or so. Remove 2 bolts and swap the plugs to the new 1.



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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?

Posted on Apr 26, 2010

  • Bruce Augustine Apr 15, 2017

    As far as the blower motor is concerned behind the glove box there is a blower motor resistor they usually blow 1 speed at a time from low to full, the part is not expensive usually $25 dollars or so. Remove 2 bolts and swap the plugs to the new 1.



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