Question about 1998 Isuzu Trooper

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I have 1998 Isuzu Trooper and my battery keeps losing power. I took my alternator off and had it checked it is good. I bought a new battery and it was drained in a day. Is there a fuse i need to check?

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No, I don't know about a fuse, but something is running, like the fuel pump, when you shut it down crawl underneath and listen for a hum, They have been know to stick in the on position, Make sure it is quiet in the shop or garage or do it at night outside with no traffic, If it is running, replace, in the meantime, disconnect the battery terminal when it is off. Too many drains on the battery and it will be shot. If it is not the fuel pump, put an ear on other areas of the truck and see if you hear something running, stuck on, buzzing, humming. Hope this helps.

Posted on Oct 10, 2010

  • jogwil93 Oct 10, 2010

    Thank you but it isn't draining when it is off only when running.


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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

1 Answer

1998 isuzu trooper need wiring diagram for charging system with a3.5 li5ter motor

1998 trooper new alternator and still not charging and alternator bench tested good,
Check main 80 amp fuse in engine compartment and also check fuses in inside fuse box, there two in that one. first is engine fuse 15amp and the 10amp gauge fuse,

Here is the wiring diagram for the charging system as you asked for , also check connections, follow battery wire off the back of alternator make sure connections are good , that wire runs to engine fuse box and that is one fuse that i said to check it is 80amp, hope this is helpful good day9_30_2012_10_15_05_pm.gif

Sep 30, 2012 | Cars & Trucks

1 Answer

1991 isuzu trooper II - new battery, battery tested good. NO POWER at all - no lights, no ignition dinging, no interior lights, no brake lights NOTHING!! any suggestion as to where to start tooking for...

Hello and welcome to FixYa!

If the battery light is on, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.

If the battery won't hold charge even on a new alternator then the problem will be on the battery itself. It surely is in the end of it's service life and replacement will be necessary.

You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.

Hope this helps and thank you for using FixYa! Have a good one!

May 23, 2011 | 1991 Isuzu Trooper

2 Answers

I have a 1998 Isuzu Trooper. The battery keeps going dead. I bought a new battery and took the alternator off and had it checked. The alternator is good and the battery keeps dying. Is there a fuse I am...

Well, not necessarily a fuse, but a current draw. You need to find the draw.

Pull the fuse for the interior lights (so you can open doors and not alter your tests) and clock. Take off negative battery cable and put the volt meter or test light in series between batt terminal and cable. If the light lights or volts higer that a couple of volts, disconnect items one at a time and re test.

Start with the alternator, it is the most likely. It has a series of diodes that change current from alternating to DC, when one fails it leaks current. The unit may still charge, but not as well as with good diodes. The only test for diodes is a scope, or take it apart and test them individually. Use ohms and current flow in one direction, reverse test leads and no current. Failed diode will flow or connect in both directions.

Anyways, you will have an answer pretty quick if you test battery current draw and disconnect one system at a time and retest.

Oct 10, 2010 | 1998 Isuzu Trooper

2 Answers

I replaced the battery in January for my Isuzu

In today vehicle there are many electronic device that still draw power from the battery.

Car radio memory on station pre-set
Car radio clock
Computer/ECU to save driving parameters
Car alarm + sensors
Power seat menory

To prevent problem,I will start the engine for 5 minutes once a week.

If are in an enclose area and has access to a power outlet then it's a good idea to connect a float battery charger to keep the battery is optimal condition.

Here is a sample of float charger / battery tender.

It's on sale for $7.99 now or you can but better quality one at your local auto part store for $30+

Link to Harbor Freight page HERE

It's a good idea to check for worn belt and weak alternator.

A belt with 60,000 or 5 years should be replace.

Check the voltage at the battery terminal after the engine is warm up for 5 minutes. The voltage should be above 13.8V

Auto supply store may provide more in-depth battery and alternator testing for free.

Please email me if you have any question.

Jul 12, 2010 | 2002 Isuzu Trooper

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

1 Answer

My trooper just had a sudden power loss . shut it off, would'nt start back up. cleaned battery terminals, jumped it off. dramatic power loss, head lights dim. think mabey problems in the fireing?

try replacing ur altinator usually when u lose power or headlights go din it usually means ur alternator has lost its charge and will not hold up enuff juice to keep ya car running.

Feb 18, 2010 | 1995 Isuzu Trooper

1 Answer

Our R reg Isuzu Trooper diesel 4x4 occasionaly discharges its battery overnight. It has had a new Alternator (and Starter) since the fault arose but it still does it about once a month. Any ideas?

Please check the cutout. Sometimes it does not disengage and thus keeps discharging the battery even after the vehicle has been switched off.

Jan 09, 2010 | 2000 Isuzu Trooper

1 Answer

Engine misfires, power loss when warm and under load

What grade of you do you have ? must be 5/30 fully synth or it breaks down when hot and makes for a misfire.

Apr 02, 2009 | 1998 Isuzu Trooper

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