Question about 1996 Isuzu Rodeo

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I have a 1996 Isuzu Rodeo. I just replaced the alternator. I have a voltage meter on the dash. When I start the Rodeo, it shows about 14 volts of power on the meter. When I am driving and accelerate, the voltage drops to about 8 volts and a warning light showing the battery and brake flash on. After about 15-20 seconds, the voltage will return to about 14 volts. I have found no loose connections. This makes this car very unrelyable.

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Also the voltage regulator can be going out but I seriously doubt that. When they do go out they register no charge at all at 99 percent of the time

Posted on Sep 11, 2010

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This may be caused by a bad Voltage Regulator in the alternator. It is quite possible that you have a faulty alternator. It seems that the regulator may be going in and out. I would have the alternator tested.

Posted on Sep 11, 2010

  • stan52r Sep 11, 2010

    I have replaced the alternator twice so do not believe it is a bad regulator, I have two diodes in the fuse panel but cannot determine how to remove them.

  • Nick Sep 11, 2010

    typically replacing diodes involves soldering. You may have to remove the whole fuse panel to do this.

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Related Questions:

2 Answers

How to fix voltage regulator


The regulator is inside the alternator. Get a new alternator or disassemble the alternator and install a new one. My option is get another alternator.

Feb 08, 2015 | 1995 Isuzu Rodeo

1 Answer

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...


Could be the alternator .
A Battery store could test your car's battery and alternator to determine if the alternator is working correctly and that the cars battery is ok as well.

Apr 21, 2017 | 1996 Isuzu Trooper

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Charging problem. Have a 97 isuzu rodeo 2wd put new alt and battery in it and when I put a load on the volt meter drops to 12.7. At idle it's on 14 . Why is it doing this?


Because of the load. It will drop in voltage, this is normal. As long as it stays above 12 you will be fine. But just to be sure start the car and turn everything on, then check the voltage. If it stays at 12.7 it's good.

Aug 09, 2011 | 1997 Isuzu Rodeo

1 Answer

Isuzu rodeo 04 loss power on hills will not rev above 2000 revs have checked fuel supplie ok


Take your altenator to AutoZone and have it tested. If the voltage regulator is defective, you might notice your volt meter running up over 14 volts. The extra voltage messes with the electronic shift and your car stays in high gear instead of downshifting.

May 16, 2011 | Isuzu Rodeo Cars & Trucks

1 Answer

I am having a problem with the voltage system in the Rodeo I just bought. We replace the Alternator and Battery with new ones yesterday and still today the same problem occurs and it will not run unless...


Isuzu Rodeo Recalls Rodeo ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR Recall - ID# 31705 Recall Date MAR 07, 1997 Part Affected ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR Model Affected RODEO Potential Units Affected 118485 Get Details Recall Date MAR 07, 1997

Model Affected 1994 ISUZU RODEO

Description AN INTEGRATED CIRCUIT WITHIN THE VOLTAGE REGULATOR CAN CONTAIN MANUFACTURING ERRORS.

Consequence THIS CAN CAUSE EXCESSIVE ELECTRICAL CHARGING OF THE VEHICLE'S ALTERNATOR, RESULTING IN ENGINE CONTROL MALFUNCTION, AND/OR EVENTUAL ENGINE STALL.

Remedy DEALERS WILL REPLACE THE VOLTAGE REGULATOR WITH A NEW REGULATOR.

Potential Units Affected 118485

Notes ISUZU MOTORS LIMITED

Dec 14, 2010 | 1994 Isuzu Rodeo

1 Answer

1996 Jeep Cherokee Sport gen light left side of main dash comes on and stays on until car is shut off. Battery charges fine and the gauge (also in the dash) shows close to 14 v as confirmed with an...


Voltage should be more than 14--closer to 14.5. Alternator is starting to pack up. Recommend you replace--good insurance. Let me know if you need instructions.

Nov 09, 2010 | 1996 Jeep Grand Cherokee

3 Answers

When the Jeep was new the volt meter read 14 volts....now the volt meter reads 13 volts with a one year old battery. Since the battery is a 12 volt battery should there be any concern that the volt meter...


It needs to be looked at,hook a volt meter to the battery,and start the engine,turn the ac on high blower,and the head lights on,the alternator should be putting out 13.65 volts to 14.25 volts,if it is any lower than this,replace the alternator,now,if the reading is not the same as in the vehicles volt meter,then the cables,positive and negative need to be replaced,the cables get old,and corrode on the inside and break down,they do not carry the current as they should.Shuold you decide to replace them,go with a larger diameter cable,both positive,and negative.

May 28, 2010 | 1996 Jeep Grand Cherokee

2 Answers

1994 olds cutlass supreme volt gauge shows low I have a new battery and a new altenator could the both battery and altenator put out correct volts no drain on battery even change dash volt meter still in...


check with a volt meter if u have 12 volt at the big lead on the back of the alternator engine off

if thats good start engine check to see if alternator is charging check the battery a good alterntor charges 13.5 - 14 volts, u may have a bunk alternator

Mar 25, 2010 | 1994 Oldsmobile Cutlass Ciera

1 Answer

1999 Isuzu Rodeo blinking lights


low voltage pulling by what your saying it sounds like your alternator is about to give up seeing that it cant disperse elec. to other units so its draining off the battery

change out the voltage regulator they didnt change your alternator they just rebuilt it or did nothing it sounds like

voltage regulator = adjusts the voltage
some are built on the alternator and is replaced at once with new alternator
others look like a little fin like an amp usually black in color this you will see bolted on the fender right or left this is a voltage regulator

somtimes you get a bad alternator in box when it can be new this is a chance chance cause now most parts are remand.
i still believe its your alternator you either of several things
got ripped off
got a bad alternator in replacement or
you got a bad voltage regulator by itself
looks like this
d5b255e.jpg

Dec 06, 2008 | 1999 Isuzu Rodeo

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