Question about 1993 Isuzu Trooper

1 Answer

The gas, brake, battery, cruise control, and 02 sensor lights all come on and the voltage drops and the alternator tested good. When voltage comes up lights go out. Fluctuates between 12 and 16 volts when charging.

Posted by on

  • Anonymous May 12, 2009

    i have this problem when i wash the car due to the fact that altenator is near the passenger front wheel. also power steering fluid constantly leaks into the alt.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 106 Answers

It sounds to me like the voltage regulator is acting screwy.I believe on your vehicle it is an integral part of the alternator.The alt.may be testing satisfactory as far as output but it may not be regulateing the voltage correctly.

Posted on Mar 06, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

2010 Cadillac dts the cruse control don't work sometimes and the brake lights don't turn off and the switch key will not come out ,other times it works normal

The crusie control not working would be caused by brake lights being on same as for the key not coming out . You need to test the brake pedal position sensor . The brake pedal position sensor is under the dash hooked to the brake pedal arm . You need a wiring diagram to tell which wires are what . The pedal position sensor isn't like brake light switch from years past , it's an input for the BCM - body control module .There is three wires at the switch , 5 volt ref. , ground and signal . All go to theBCM . You could have a sensor problem , problem with the BCM . There could be DTC'S - diagnostic trouble codes stored in the BCM .
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake pedal is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.

Your best bet would bet to take it to qualified repair shop

Jan 04, 2017 | 2010 Cadillac DTS

1 Answer

I have a 1995 poniac bonneville and every time i press the brakes the gauges drop. Battery is good. Alternator good. Lights dim and some time kills my car

the brake lights will not kill a car or dim lights so there is a massive short in the system or the battery is not as good as stated
check for battery terminals ( posts and terminals) are shiny clean and tight including the ground wire for the battery
have the battery load tested ( not voltage tested )
check the alternator output ( auto electrician ) check the drive belt is in good condition and tight

Oct 21, 2015 | Cars & Trucks

1 Answer

Indicator lights on the dashboard won't go out

Usually when your lit up like a christmas tree its a sign of battery not getting full charge. Check the wring harness first, (if alternator is new it should be under warranty so worth checking that out.) Especially if you have a multimeter handy: check DC voltage at the battery. with it running a decent charge would be abour 13.7-14.1. if you're some where around there you're good. if it's below that your alternator is failing in some manor.

Jul 10, 2013 | 1995 Volvo 850

1 Answer

99 grand marquis the battery light would come on and off so i replace the battery... battery light stil came on. So i replaced the alternator now the battery light comes on an stays on once my car has...

You should use a motorcraft alternator , Not aftermarket ! Do you know how to do automotive electrical circuit testing ? Voltage drop testing , How to read an use a wiring diagram to pin point places in a electrical circuit to do tests ? Do a charging system voltage drop testing , test engine ground etc...
The Trainer 47 What measuring voltage on the ground side means

Electric Testing Techniques You Need to Know
There is a lot involved in find electrical gremlins if you don't know how to test . A couple basic test with a voltmeter is usually all it takes !
Starter Voltage Drop
How to Test an Alternator

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

May 12, 2017 | Cars & Trucks

3 Answers

Crusie control does not work on 2011 gmc sierra 1500 and I've already replaced the switch?

If the switch is replaced,then it can be wiring issue or faulty cruise control board.But as the switch is replaced,get the voltage at the switch tested to confirm the switch is actually receiving voltage.If no voltage received at switch power supply wire then ,apply external 12 volt power to the cruise control switch wire and then see if cruise control comes ON.If yes,then you know wiring is issue.

On this case, to troubleshoot this problem, there are solved help links. Click the link directly and refer the details to solve this problem yourself, with help of diagrams: ------

Ford ranger cruise control not working?


Horn and Cruise control quit working?


Horn and cruise control not working on Plymouth Grand Voyager?


Horn and Cruise control quit working on 2003 Jaguar S-Type?


Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500


Cruise control stop working on 1994 Ford ranger?


Cruise control not working?


1996 Ford Explorer: Cruise Control Wiring Diagram?


These will help.


Nov 28, 2012 | GMC Cars & Trucks

1 Answer

Sometimes my battery light comes on and then goes off after a minute or so, sometimes stays on for a long time. I managed to get home without it coming on once which was about a 25 minute dirve, but I...

Here is a simple test to determine the condition of the battery and alternator.
First, make sure the battery posts are clean and the cables are in good shape.

Using a volt meter, check standing battery volts at the posts, with nothing in the car on.
Lets say 12 to 13 volts is good. If standing battery voltage is way less than 12 volts the battery is probably bad.
Now start the engine, make sure no electrical items are on and check the battery voltage at the posts again. This reading should be 1 to 1.5 volts higher than the first reading.
If there is little or no change, or less volts then the alternator is bad.

Just for fun, while the engine is running, turn on the things you normally have on when driving and check the voltage one more time. If volts continue to drop, then without a doubt its the alternator.
Hope this helps.

Aug 04, 2011 | 2000 Dodge Neon

1 Answer

My 96 nissian maxima turns off when driving down the road i try to turn the key ,lights in dash on horn blows but will not startcould it be alternater ,or what how does the 02 sensor go by functioning ...

As of 1996,all cars sold in the US were required to have an OBD-II computer interface port.
You may want to go to Advance Auto Parts, AutoZone, or Pep Boys, and get a free read
of the code(s) that you computer may be posting to help with your diagnosis.

The code coming from your vehicle's computer may be one or more of:

P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1)
P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)
P0132 02 Sensor Circuit High Voltage (Bank I Sensor 1)
P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)
P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)
P0137 02 Sensor Circuit Low Voltage (Bank I Sensor 2)
P0138 02 Sensor Circuit High Voltage (Bank I Sensor 2)
P0139 02 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P0141 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0142 02 Sensor Circuit Malfunction (Bank I Sensor 3)
P0143 02 Sensor Circuit Low Voltage (Bank I Sensor 3)
P0144 02 Sensor Circuit High Voltage (Bank I Sensor 3)
P0145 02 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146 02 Sensor Circuit No Activity Detected (Bank I Sensor 3)
P0147 02 Sensor Heater Circuit Malfunction (Bank I Sensor 3)
P0150 02 Sensor Circuit Malfunction (Bank 2 Sensor I)
P0151 02 Sensor Circuit Low Voltage (Bank 2 Sensor I)
P0152 02 Sensor Circuit High Voltage (Bank 2 Sensor 1)
P0153 02 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0156 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0158 02 Sensor Circuit High Voltage (Bank 2 Sensor 2)
P0159 02 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0160 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0162 02 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163 02 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164 02 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165 02 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)

Note: "Bank 1" is the side of the engine with cylinder 1. "Bank 2" is the other side.

P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Maximas with the VE30DE and VQ30DE engines use a distributorless ignition system that is controlled by the Engine Control Module (ECM). The ECM receives a signal from the crankshaft sensor (the CPS - Crankshaft Position Sensor), and processes the signal based on inputs
from other various engine sensors, including the Oxygen sensor.
(this is the role of the O2 sensor in ECM operation).
Then the ECM sends signals to each of the individual coils in the proper firing order.
This system is more efficient than a distributor, and has fewer moving parts. The high voltage coils are directly attached to each spark plug, allowing a higher energy spark within the cylinder. A high energy spark means a faster, more thorough burning of the air/fuel mixture, which produces more power and lower emissions.

SECONDARY SPARK TEST - works for all cars, including Maxima.

1. Remove the spark plug.

2. Install the spark plug to the ignition coil/coil pack, then attach the coil wiring.

3. Ground the plug at a good ground location on the engine.

4. Crank the engine and check for spark.

5. If spark occurs, the ignition system is functioning properly.

6. If no spark exists, test the ignition coil/coil pack, power transistor and related wiring.

HEI Ignition Spark test - works for all cars, including Maxima.

The next level test you may want to try is a HEI (high energy ignition) spark tester kit. Cost is
about $30 at most auto parts stores. Harbor Freight Tools sells a chinese equivalent for about $16.
Place the spark tester on each of the spark plugs, and watch as the little light in the tester will
light up each time the spark plug is fired by the computer. You can actually see weak or
intermittent sparking as the motor runs - you can tell by the relative strength of the light as
you compare the intensity and duration of the light across all 6 cylinders.

If your problem were the alternator (or its built-in voltage regulator), your battery would not be
getting a proper charge, and you
wouldn't be able to start the car after a drive, since the battery would have been drained during the
drive - normally, the alternator will both charge the battery and run all electrical
features of the car during a drive.

To test your alternator, place your DMM (digital multimeter) across the battery terminals while the
car is running - it should read 13.5VDC to 14.5VDC. With the car off, you can test your battery
voltage with the same DMM - it should read 12.65 VDC (for a fully charged battery).

Alternatively, you can take your car to Advance Auto Parts, AutoZone, or Pep Boys, and they'll
attach their "charging system tester" to your car and give your car a nice test for free.
I do this with my customers' cars just to get that nifty printout of the problem. Its nice
to show a vehicle owner somethng in black & white when I'm recommending a new charging
or ignition system component (some of which can be a bit pricey).

Jul 15, 2011 | 1996 Nissan Maxima

1 Answer

My Chrysler Town and Country dash board lights (oil, engine, airbag) started blinking on and off. The RPMS were going up when they shouldnt have been. The mileage would read miles then blink DONE. The...

Hi, this can happen when the voltage drops too low. If you have a voltmeter, check the voltage at the battery with the engine running. It should be around 14 volts. If it is much less, remove the alternator and have it tested at your local parts chain. If the voltage is good, you may need a new instrument cluster. Please let me know if you have more questions, and thanks for using FixYa.

Mar 01, 2011 | 2002 Chrysler Town & Country

2 Answers

Battery and brake lights flicker and headlights dim

Sounds like a low voltage problem, alternator not charging properly. When you press the gass the motor takes more juice from your battery to fire the spark plugs have you had your charging system tested (most auto parts places do it for free)? Either that or a loose wire causing the short. Check all grounds under the hood and make sure they all have a good contact

Aug 06, 2009 | 2001 Mitsubishi Eclipse

1 Answer

My 02 yukon has a tendency to stall when I'm turning into a parking space or backing out of one. It only does it a really slow speeds. When i come to red light the engines battery gauge drops than picks up...

Did you clean the mass air flow sensor when you changed the filter? Get some MAF sensor cleaner and follow the directions. Have the alternator tested. Do you run the gas tank all the way to empty all the time? If so the pump may be shot the pump needs to be submerged in gas to keep it cool if you run it below 1/4 tank a lot its life is considerably shortened. you could also have a vacuum leak ,so that when you apply the brakes there is not enough vacuum left to run right. lastly the Idle air control motor could be weak.

Apr 24, 2009 | 2002 GMC Yukon XL

Not finding what you are looking for?
1993 Isuzu Trooper Logo

Related Topics:

141 people viewed this question

Ask a Question

Usually answered in minutes!

Top Isuzu Experts


Level 3 Expert

77201 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14384 Answers

Are you an Isuzu Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides