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New Alternator...voltage jumping 0-19
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dave284
Enthusiast
Aug 11, 2008, 3:14 PM
Post #1 of 10
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New Alternator...voltage jumping 0-19
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2003 chev SS silverado 1500 6.0L, Had a new alternator installed and still doing same thing, gauge on dash goes to (0) then jumps to or pass 19,I used a meter and the read outs are not the same as the volts gauge, this vehicle was doing like this before the new alternator.I suppose the question is...is the voltage regulator inside the alternator or is it located somewhere else and does the computer control the regulator? There are no trouble codes and the battery is new, and I don't know if this have any connection with it but the oil pressure gauge has stopped working. Any insite would help, thanks.
Dave
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Double J
Veteran
/ Moderator
Aug 12, 2008, 10:51 AM
Post #2 of 10
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Re: New Alternator...voltage jumping 0-19
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Dave
GM does have concerns with the instrument panel cluster gauges.
They issued a 'Special Policy' on the clusters extending the warranty coverage on them to 7 years or 70k miles.
Not all vehicles are affected...Need to contact GM and Have them check by the vehicles VIN breakpoints.
Here is an excerpt from the bulletin...#07187A
Condition
Some customers of 2003-2004 model year Cadillac Escalade, Escalade ESV, and Escalade EXT; Chevrolet Avalanche, Silverado, Suburban, and Tahoe; and GMC Sierra, Yukon, and Yukon XL vehicles have reported that one or more of the instrument panel (IP) cluster gauges stick, flutter, or become inoperative. This may cause inaccurate readings, including the speedometer and fuel gauge.
Regulator is internal in the alternator.
You mentioned you used a meter and the readings are not the same.
What are they?
Hope this helps
Might/might not
Just passing it along
Jim
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DanD
Veteran
/ Moderator
Aug 12, 2008, 11:02 AM
Post #3 of 10
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Re: New Alternator...voltage jumping 0-19
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Chev pick-ups are famous for bad instrument clusters.
If the voltage at the battery is staying consistent and showing “normal” voltages then your charging system is likely ok?
Dan.
Canadian "EH"
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dave284
Enthusiast
Aug 12, 2008, 12:37 PM
Post #4 of 10
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Re: New Alternator...voltage jumping 0-19
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Thanks Jim, I checked that out and the vehicle has 121,000 on it and so the dealership would charge for any repairs, I know some that the pcm controls the regulator....but the gauge was going from (0) to all the way to the other side....sometimes it stays at 14.Today I had the battery tested as well as the alternator at Autozone...battery good....alternator bad, but I also checked with a couple of chevrolet dealerships on this matter one told me that if the battery was disconnected it would have to be reprogrammed and the other said it it wouldn't unless another pcm was being installed ???? Dan, the dealership also mentioned the cluster too, the batt showed 13.87 on my tester but when the vehicle was running the the numbers were jumping like crazy up and down so fast I couldn't read them...the last reading I got was 1.734 and the engine was stalling at that point. I ordered another alternator but wasn't positive on the amp rating 105 or 145?...so I went with the 105, I don't know what the original was since the one in it now is an aftermarket put in by another person....But soon as I get the new alternator in that should shed some light on this....until then I'm assuming that the little problems could be the result of the voltage problem. Thanks Jim & Dan, I'll let you all know something tomorrow.
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Double J
Veteran
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Aug 12, 2008, 12:43 PM
Post #5 of 10
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Re: New Alternator...voltage jumping 0-19
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Just checked..the original alternators were stamped 130 amp but that is incorrect..
Its supposed to be the 145 amp
Jim
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DanD
Veteran
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Aug 12, 2008, 1:11 PM
Post #6 of 10
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Re: New Alternator...voltage jumping 0-19
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Just had a read through the Pof O and this regulator is not PCM controlled on this year of truck.
I also think your right in waiting to diagnose the gauge issues, until you have a properly functioning charging system.
Keep throwing voltage spikes into the IPC and it’ll likely start speaking Chinese to you. LOL
Dan.
Canadian "EH"
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dave284
Enthusiast
Aug 12, 2008, 11:56 PM
Post #7 of 10
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Re: New Alternator...voltage jumping 0-19
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Thats great, the owner just dropped off the one that has 105 amp tonight, Jim, this might be a stupid question but if the 145 amp is the right one why does Autozone offers a lower one for the same vehicle? I'm afraid to ask the dealerships.LOL.... Dan, I checked with two different manuals, one said the pcm controls the regulator and I believe that was the Haynes repair manual. So tomorrow I'll exchange the alternators, I'm hoping this will also take care of the oil pressure gauge and the dual climate control...both are set on a/c but one is blowing heat. I may have to learn chinese.LOL
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Double J
Veteran
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Aug 13, 2008, 12:49 PM
Post #8 of 10
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Re: New Alternator...voltage jumping 0-19
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Here is the bulletin i read for this...
Bulletin No.: 04-06-03-001
Date: February 03, 2004
INFORMATIONSubject:
Incorrect Amp Code On Generator
Models:
2003-2004 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2004 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe
2003-2004 GMC Denali XL, Savana, Sierra, Yukon, Yukon XL
2003-2004 HUMMER H2
The purpose of this bulletin is to inform the technician of an incorrect Amp code stamped on the generator. The code on the side of the generator reads 130 A and it should read 145 A. The 130 A has been stamped on the generators in error and does not indicate the actual amperage of the generator. A 130 A generator is not produced for this vehicle. The correct replacement for the above vehicles is the generator with the 145 A marking.
Jim
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dave284
Enthusiast
Aug 13, 2008, 2:59 PM
Post #9 of 10
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Re: New Alternator...voltage jumping 0-19
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Jim, would the difference severely affect the operation of the vehicle to the point where the climate control is working only on one side of a dual system, and the oil sending unit...I think its just bad. I'm still wondering about the pcm causing all this mess, you know, controlling the regulator. And if a low amp alternator is the cause, would the voltage be jumping like numbers to a combination lock?, something like this 8-10-47-9-36-3. I know the one manual stated the voltage regulator was computer controlled... its a bunch of aggravation when you can't get the right info, even from the manufacture.And Autozone don't stock one with a 145 amp rating,but Advance auto parts does, I was planning to switch out the one he brought last night...but he purchased it with a check...I'm at a stand still now. Thanks Jim....let me piss off the owner and tell him he has to drive another 50 miles to get to my shop.
Dave
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dave284
Enthusiast
Aug 15, 2008, 6:04 PM
Post #10 of 10
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Re: New Alternator...voltage jumping 0-19
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I replaced the PCM and had the chev dealership to (flash) program it...that took care of the alternator problem and also cured the dual climate control too, however the oil sending unit was bad on its own,thanks guys for your advice.
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