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My 89 corvette was running great and suddenly the voltage
My 89 corvette was running great and suddenly the voltage startwd dropping and drained battery. Battery was just tested and is good. Advanced auto tested the car and it came up "not charging". I dont … read more
Edward
Edward
Professional at Justanswer.com
Associate Degree
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2001 vette. Old alternator had bad regulator and would
2001 vette. Old alternator had bad regulator and would intermittently spike to 17 volts. finally stopped charging..replaced it and ive got 14+ volts at the alternator but only 11 or so at the battery … read more
kalamykid
kalamykid
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I have a 2007 trailblazer 4.2 was over charging, replaced
I have a 2007 trailblazer 4.2 was over charging, replaced alternator then was working fine. then the a/c compressor went. now once the engine at highway driving of about 45 min to 1 hr the voltage dro… read more
Tim's Auto Repair
Tim's Auto Repair
mechanic
High School or GED
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Chevrolet Silverado 1500: I have a 2001 Chevy Silverado 1500
I have a 2001 Chevy Silverado 1500 4wd with a 5.3 v8. I was driving to work the other day and my battery light came on and the voltage started dropping on the gauge. The truck didn't die and I made it… read more
Gary
Gary
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Vocational, Technical or Trade Scho
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2002 Astro: running fine..on highway..put a new battery..alternator
2002 Astro Van AUTO, after 3 hrs of normal turnpike 65 mph travel noticed battery low indicator came on, voltage gauge was down in red zone--10 volt area.. pulled over and stopped.. [engine was runnin… read more
Gary
Gary
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2007 Tahoe: Soon I experienced electrical problems.
I have purchased a 2007 Tahoe LTZ. Soon I experienced electrical problems. Complete electrical shutdown at times. The dealership replaced the battery, no change. Changed the battery cable, (negative p… read more
Michael Moore
Michael Moore
Team leader, bumper to bumper tech.
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Trailblazer: chevy..dealership..my alternator and I..pulling
I had brought my Trailblazer to chevy dealership because my vehicle was overcharging and then dropping to 12 - 12.3 and the mechanic stated that is was my alternator and I had a bad connection and wou… read more
GM Tech (Cam)
GM Tech (Cam)
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Vocational, Technical or Trade Scho
15,756 satisfied customers
2007 chevy: my dash..jump..we replaced battery..alternator
yesterday my 2007 chev silverado as i was comming home showed the message brake system failure on my dash. followed by charging system failure message truck was still running upon getting home i turne… read more
Kenny
Kenny
ASE certified Technician
High School or GED
227 satisfied customers
97 Blazer: new alternator..steady..9 to 14 on the gauge..drove
I have a 97 Blazer have put in a new alternator but it will not hold a steady voltage. When driving the voltage constantly goes up and down from 9 to 14 on the gauge and when you let off of the gas to… read more
Tim's Auto Repair
Tim's Auto Repair
mechanic
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8,884 satisfied customers
I have a 2008 GMC Sierra. Recently noticed alternator gauge
I have a 2008 GMC Sierra. Recently noticed alternator gauge was hovering in the 11.5 to 12.5 volt re4ading instead of the normal 14. Battery found to have bad cell. Replaced. alternator stayed up for … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
12v..external voltage regulator, alternator and belts which are tight
i have a 1970 c-10 and the problem i have is there is 14v leaving alternator but only 12v or less (depending on charge on battery). have replace external voltage regulator, alternator and belts which … read more
Mike S.
Mike S.
Vocational, Technical or Trade Scho
8,034 satisfied customers
2007 1500 Silverado with the 5.3 engine...fluctuate..re started..hits
I have a 2007 1500 Silverado with the 5.3 engine. I had to change the battery yesterday because the battery would not take a charge, now the gauge on the truck seems to fluctuate from over the 14 volt… read more
BOBBYSS
BOBBYSS
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Associate Degree
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Occasionally..alternator voltage indicator..engine warms up..cooling
Occasionally the alternator voltage indicator will drop to less than 10 volts and the battery light will come on. This usually happens when the engine warms up. After cooling, the alternator voltage w… read more
Jim
Jim
Vocational, Technical or Trade Scho
1,491 satisfied customers
2007 Suburban: brand new..battery died..been a defective battery
I bought a brand new 2007 Suburban in May 2007. In March 2009 the battery died. The Service Adviser said it could have been a defective battery. I notice the suburban starts a little funny now. When I… read more
GM Tech (Cam)
GM Tech (Cam)
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Vocational, Technical or Trade Scho
15,756 satisfied customers
I have a 1988 corvette coupe that runs the battery down . When
I have a 1988 corvette coupe that runs the battery down . When the engine is running the voltage shows 14.4 at idle and as the engine warms up the voltage will drop below 12 volts. Sometimes when I ha… read more
Ivan
Ivan
Automotive Instructor
Bachelor's Degree
4,857 satisfied customers
1981 GMC: goes back..alternator checked..good new battery clean posts
have 1981 GMC with a 305 voltage indicator shows decharging when the blower motor slows down then goes back up to charging when the blower motor speeds up. thought it was the fan motor but I replaced … read more
frank
frank
Vocational, Technical or Trade Scho
1,892 satisfied customers
1998 chevy: tranny..light went..the batt gauge was real low,@10
i have a 1998 chevy s-10. Newer tranny- had it's problems with SES light going on due to tranny codes and 02 sensor codes. Recently the SES light went on again- ran it's course and shut itself off.Now… read more
Roy Colquitt
Roy Colquitt
Meter Specialist I
Associate Degree
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12 volts..problems with the engin mis firing to the point..light came
I have a 1997 S-10, The problem is that at times while driving the voltage guage drops from 1/2 to approx 1/4 on the guage. The lights dim out and then the voltage goes back to 12 volts. I also starte… read more
Virtual Wrench
Virtual Wrench
Owner of LJ Auto Repair 37 years
Associate Degree
14,398 satisfied customers
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Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,756 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

18,051 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,884 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

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ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

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A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

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Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,836 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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