Go Back  Isuzu Forums - Isuzu Enthusiasts Forum > Past Models > Trooper
Reload this Page >

Voltage drop during acceleration... '96 3.2l sohc

Trooper Talk about Isuzu Trooper related topics here...

Voltage drop during acceleration... '96 3.2l sohc

  #1  
Old 08-24-2010, 09:19 PM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 17
Default Voltage drop during acceleration... '96 3.2l sohc

So the other day I noticed my dash lights dimming during acceleration and sure enough, I glanced over at the gauge on the dash and it would drop to 12 while I accelerated, once I took my foot off, the reading went back to normal...I have never seen this before, on anything.......Its a 1996 (10/95) Trooper 3.2 sohc with 181k miles on it. Also has a brand new alternator from NAPA that has less than 150 miles on it. I took it to NAPA and had them run an electrical test on it, it passed on everything from the battery to the alternator... Everything is working just fine, just the movement on the gauge.Also I did notice that the lights dim/gauge moves in rythym with the turn signal. That I have seen before on other cars, is this connected to the acceleration things too?Any guesses?
 
  #2  
Old 08-31-2010, 10:00 AM
Member
Join Date: May 2010
Posts: 86
Default

The alternator should be producing more current when accelerating because of the higher RPMs. The opposite of what is happening to you.
Does it have an external voltage regulator or is it in the alt?
 
  #3  
Old 09-02-2010, 01:33 AM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 17
Default

Im pretty sure that it is an internal regulator...

I cannot be certain until I read through my repair manuals, but are most cars of this age and newer all internally regulated?
 
  #4  
Old 09-02-2010, 09:04 PM
Member
Join Date: May 2010
Posts: 86
Default

Yes, usually they're internal now, just thinking of possible answers to your problem.
 
  #5  
Old 09-23-2011, 08:08 PM
Junior Member
Join Date: Sep 2011
Posts: 2
Default

My trooper has the same problem. Did anyone find a solution?
 
  #6  
Old 02-19-2012, 05:13 PM
Junior Member
Thread Starter
Join Date: Jun 2010
Posts: 17
Default

NO...

But, it never really caused any problems.

I guess its more of an anomaly than a real problem.


Did yours ever become an issue? I cant say because I ended up selling mine.
 
  #7  
Old 02-21-2012, 02:21 AM
Junior Member
Join Date: Feb 2012
Posts: 10
Default

Seriously, lots of people rest their foot on the clutch without realizing. It's a one way ticket to a burned out throwout bearing, not to mention new clutches much too often.
 
  #8  
Old 03-13-2012, 12:37 AM
Junior Member
Join Date: Mar 2012
Posts: 3
Default

I have the same truck and the same thing happens. I did some research and found this is normal. The ECM tells the alt to stop charging during hard acceleration to lessen the load on the engine. I should have looked this up before pulling the alt and testing it.
 
  #9  
Old 08-01-2012, 04:15 PM
Junior Member
Join Date: Aug 2012
Posts: 3
Default Voltage drop during hard acceleration- '97 Trooper

I found this on another site. Does anyone know if this tech bulletin also applies to the '97 model (3.2 LX)? I just had new alt installed and they said the drop is normal?


1996 Isuzu Truck Trooper V6-3165cc 3.2L SOHC (6VD1)
SB96-04-L002
ISSUE DATE
FEBRUARY 1996
GROUP
ELECTRICAL
1996 TROOPER (UX) AND RODEO (UC) VOLTMETER NEEDLE
DROP DURING HARD/QUICK ACCELERATION
AFFECTED VEHICLES
1996 Trooper (UX) and Rodeo (UC) models.
SERVICE INFORMATION
On all affected vehicles, the instrument panel voltmeter needle will drop during hard/quick acceleration. This voltmeter needle drop is normal and is not indicative of a condition requiring repair.
1996 vehicles are equipped with an alternator that is designed to stop charging during certain engine speed modes in order to lessen engine load. At idle, the alternator will output approximately 14.3 volts. During a slow/steady acceleration, the alternator will remain at a 14.3 volt output. However, during a hard/quick acceleration, the alternator output will drop to 12.7 volts. The alternator will continue this 12.7 volt output, until the Powertrain Control Module (PCM) detects a drop in engine speed, at which time, it will return the alternator output to 14.3 volts.
 

Last edited by Trooper012; 08-01-2012 at 04:25 PM. Reason: edit
  #10  
Old 08-11-2012, 02:10 PM
Member
Join Date: Aug 2012
Location: Woodlawn, Maryland
Posts: 82
Default

I just wanted to agree with Trooper012's information. I have been a mechanic for 40+ years and still own a bunch of Troopers. I was going to give the same information. I think when they went to the 3.5 motor they dropped this idea as they had more power. The voltage was controled by the TPS and manifold vacuum to give that little extra power and once the load was dropped everything goes back to normal.
 

Thread Tools
Search this Thread
Quick Reply: Voltage drop during acceleration... '96 3.2l sohc


Advertising
Featured Sponsors

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.