I have a 1996 Isuzu trooper and when i start it it runs fine then after awile the chirping /squeal starts. and the voltage meter was under 12 violts then a fan would kick on and the volts would go up to 14 volts and the squeal would stop. we replaced the fan clutch (we were told that was the problem),It helped some now it just chirpes and doesnt squeal anymore . Now today my Brake light, my 4 wheel drive light and my battery light came on, But it still starts what could be the problem we've heard so many things confusion has now set in oh yeah we reolaced all the belts also

There are many possibilities that can cause car to make noise.

It's actually from where the noise is coming from. Front end or rear end. From engine area or from inside the steering or from brakes.

There is N-number of possibilities for the car to make grinding noise or any other kind of noise.

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For step by step troubleshooting this problem, I suggest you to refer the help links mentioned below. Its a complete solution with proper explanation to identify the cause of problem: ------

Click the link below: -----

ABS light comes on and Car makes Grinding noise?

http://repairhelpcenter.blogspot.com/2012/01/abs-light-comes-on-and-car-makes.html

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Car makes clicking noise?

http://howtobyme.blogspot.com/2011/11/car-makes-clicking-noise.html

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Car makes whining noise like driving on rough pavement?

http://howtobyme.blogspot.com/2011/12/car-makes-whining-noise-like-driving-on.html

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Chirping Noise From Car?

http://technoanswers.blogspot.com/2011/11/chirping-noise-from-car.html

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What are the possibilities for Clicking noise in car?

http://technoanswers.blogspot.com/2011/11/what-are-possibilities-for-clicking.html

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Squealing at start up on car?

http://technoanswers.blogspot.com/2012/01/squealing-at-start-up-on-car.html

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Chirping sound coming from engine?

http://technoanswers.blogspot.in/2012/01/chirping-sound-coming-from-engine.html

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Vehicle making Clunk Thump Thud noise?

http://howtobyme.blogspot.in/2012/03/vehicle-making-clunk-thump-thud-noise.html

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4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

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Heater makes clicking noise under dash on Ford Explorer?

http://technoanswers.blogspot.in/2012/01/heater-makes-clicking-noise-under-dash.html

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Clicking noise under dash and front defroster not working?

http://technoanswers.blogspot.com/2012/01/clicking-noise-under-dash-and-front.html

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Car Brakes Making Noise?

http://repairhelpcenter.blogspot.com/2011/12/car-brakes-making-noise.html

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Car Alternator making noise?

http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html

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Car Alternator Bearing Makes Grinding noise?

http://repairhelpcenter.blogspot.com/2011/12/car-alternator-bearing-makes-grinding.html

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Engine makes noise and Cooling Fan belt Breaks?

http://howtobyme.blogspot.com/2011/12/engine-makes-noise-and-cooling-fan-belt.html

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Vehicle Makes Clicking Sound While Taking turns?

http://schematicsdiagram.blogspot.com/2011/12/vehicle-makes-clicking-sound-while.html

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These will help.

Thanks.

its g-sensor located at under chassis rear passenger near gas tank

It's check at the transmission pan, there is two drain plugs, the lower one is to drain transmission fluid, the higher one is to check level, with engine running and in park remove up most drain plug if fluid start to come out level is ok, if no fluid coming out will need to add some till it start to come out.

they will need to run a "diagnostic" while the problem is occurring. if not...of course everything checks ok

sound like alternater belts you changed one may not have been as good as it should try again

bad generator

whats the battery condition and voltage like?
if battery voltage goes under 10V while cranking then car wont start.

check for spark at the coils under load. May have to change some ignition coils.

If its the 3.0 diesel it could be the rail oil pressure sensor starting to pack up .

Change the fuel pump relay....and let mee know