Question about 1993 Isuzu Trooper

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Alt not chaging properley had it rebuilt twice

Alt not chaging properley had it rebuilt twice now every time put foot on breaks lights go dim and alt meter drops down 2 8 volts can anytone help me plse

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  • A Miller Jun 05, 2010

    For what you have invested, you could have purchased a rebuilt alternator and been on about your business.

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You have a dirty earth some were maybe on the engine to body or battery to body look for all the earth straps and take them off to scrub them clean with a wire brush then smear them with petroleum jelly do both battery leads as well every earth must be very clean it wont hert to smear some petroleum jelly in the alternator plug it keeps the road dirt out of it and it all helps at the end of the day,,,

Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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1 Answer

My break lights on my 94 z71 work when truck is


Well It ain't the break switch. It's the power going to the switch that's the problem, isn't it? If you run a wire from a power source (Any one will do) to the power side of the switch they should work. You don't have to worry about ignition switch or anything like that. Doesn't matter if the switch has permanent power going to it. The brake lights are only going to go if you put your foot on the brake.

Sep 20, 2014 | Cars & Trucks

1 Answer

95 Geo Prism head lights, dash board lights go dim, slows in power, check engine light comes on.


does the alt light glow, keyon (aka. chargelamp)? if not BAD !
fix that FIRST !
This is really simple in most cases.
it's a system, called a charge system.
it has 3 /4 parts.
1: Alternator must spin about 2 times crank speed.
if the engine RPM is 400 , the Alternator will give UP.
so first engine RPM 800 then i strobe the alt pulley, oops belt slips, mine runs at 1.8 ratio or 1400 rpm at alt pulley.
for a DIY is the belt tight?
2: is engine RPM at 800? no , fix that first.
3: RPM good.
The system now is ALT wires and battery. 3 things.
if the ALT is good and the battery is good (tested)
then it must be what. the wires.
The alt can put out 50+ amps..
there are at least 4 wires on most alts and any can fail.
1: big red. (huge charge wire,, or the inline fuse blown.
2: ground, old cars , and for sure in the SALT belt the gound fails
do to RUST, or better word, Corrosion and both.
alum and steel (iron) both corroded, add salt and its worses
in 2 ways corrosion and electrolysis. (google that)
so the ALT case must be grounded to the engine. 100% perfect
then engine ground stap to battery minus. if not the ALT will FAIL.
now we land on 2 more wires, most cars.
that rear connector.
1 is ignition sense wire, if open alt goes nuts.
2: is the idiot lamp. if lamp is bad, (dead) the alt can shut down.
this lamp creates boot up , initial excitation current, so the ALT can start up. most ALTS have no residual magetism to start up.
so it needs a bias circuit, to do that.
and guess what, each brand of ALT uses different parts here.
EVEN REBUILTS, so best practice, is to assume the lamp
must be good, and fix that first (early cars, ) new cars the ECU
runs the alt and is 10x smarter, not this car. at all.

no lie , testing the alt, in car is hard.
many times the ALt just shuts down. (faults)
and with zero current flow, you can not find the voltage drop
that precipitate that fall out/
there is a method but is risky , on car, called "full fielding"
it can blow up electronics,. so that is my warning.
does this help?

one other crazy failure
some cars have DRL , in uSA , some, in canada , many.
i fix them all. but the DRL in many cars, (this year)
connects the alternator, and DRL burns up and kills the ALT.
the reason DRL uses the charge lamp is easy
it shuts down DRL any time the Charge lamp is dead.
allowing more battery volteage (& current) to start, HEADLAMPS off.
same with cruise control some drop out , if change lamp is on.
to understand all this , its all in the manual. (parts effected)
at alldata dot com.

Aug 02, 2012 | 1995 Geo Prizm

2 Answers

My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

Jun 15, 2017 | Cars & Trucks

3 Answers

The battery light is flickering on and off on the dash. I put a new battery in and had my alternator checked out(its prefect) When driving at night my headlights dim and brighten.What could this be?


The regulator in the alternator is most likely the problem.
The alternator could be charging.......just not correctly....... the flickering headlights are showing a varying voltage.......and with the charging light flickering too..........99% chance you need a complete rebuilt alternator.

Oct 05, 2009 | 1998 GMC Sierra

1 Answer

Running lights acting weird


they are supossed to go out but still dim alittle right

Nov 24, 2008 | 1999 Volkswagen Jetta

2 Answers

Stalling


sounds like a worn out distributor. fairly common on this type of vehicle good luck onepx.gif onepx.gif

Sep 20, 2008 | 1991 GMC K1500

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