Question about 2001 Pontiac Bonneville

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WHY IS MY VOLTAGE FLUCUATING CONSTANTLY FROM 9 VOLTS UP TO 15 VOLTS????

MY VOLTAGE FOR THE LAST WEEK HAS STARTED TO CONSTANTLY MOVE FROM VERY LOW VOLTAGE TO VERY HIGH VOLTAGE I WOULD SUSPECT A BAD METER AS MY GAS GAUGE HASNT WORKED SINCE I BOUGHT THE CAR A FEW YEARS AGO HOWEVER WHEN THE VOLTAGE DROPS VERY LOW THE CAR GETS A MISS AND ALL LIGHTS GO DIM I JUST RECENTLY REPLACED THE BATTERY WITH A BRAND NEW ONE AND HAD THE ALTERNATOR CHECKED AND IT TESTED GOOD THIS PROBLEMS STARTS AS SOON AS I START THE CAR UNTIL I CUT IT OFF IT NEVER STOPS GOING UP AND OR DOWN.... MY CHECK ENGINE LIGHT COMES ON NOW AS WELL AS MY SECURITY LIGHT I AM NOT SURE IF THIS HAS ANYTHING TO DO WITH IT BUT THOSE LIGHTS DO COME ON AND STAY ON AND OTHER TIMES ONLY ONE OR NONE I AM STUMPED IF YOU HAVE ANY IDEAS WHERE I SHOULD START I WOULD LOVE TO HEAR THEM AND THANKS FOR READING MY POST

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  • Pontiac Master
  • 3,368 Answers

It sounds like a loose cable that is vibration sensitive. I am not exactly following you but if it stops when the car is turned off then get the alternator and or regulator tested. Your battery should hold about 13.8v when running.

Posted on Dec 14, 2014

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Posted on Jan 02, 2017

emissionwiz
  • 75744 Answers

SOURCE: Alternator or BCM problem ? Gauges drop

it is not the BCM, go to any Kragen or Autozone parts store, have them test the alt, the test is free

Posted on Feb 18, 2009

emissionwiz
  • 75744 Answers

SOURCE: 1995 firebird formula v8 charging system

Once you get the idle issue fixed the charging rate should come up to spec, to be safe take the car to a Kragen auto parts store or other chain store like it, they will test the charging system for free, that will give you peice of mind about the alternator.

Posted on Oct 16, 2008

  • 382 Answers

SOURCE: 2003 Pontiac Grand AM will not start. Security light is NOT on.

sounds to me like you better find another dealer or possibly an auto electric dealer they should have done it right the first time

Posted on Dec 22, 2009

SOURCE: why won't new alternator charge battery when car is running

Many cars have a voltage regulator that is integral to the alternator. Check to be sure it is properly connected. One year later afternoon the day before the Turkey was to be cooked I replaced the Alternator. I drove 200 hundred miles and had the car die at the gate to my destination. I failed to properly connect the Voltage Regulator on the Alternator. Look in that direction for a bad wire, fuse, connector.

Posted on May 15, 2012

  • 1207 Answers

SOURCE: new battery, car won't start

you should check the starter or ignotion, may be there have some problem on them.
__________
autel ms509

Posted on Sep 21, 2012

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2002 chevy cavalier battery shows 12.30 volts at rest. Once the car is started the voltage drops to between 10 and 9 volts. The voltage differential between bolt on the rear of the alternator and the...


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TEST B: BATTERY VOLTAGE OUT OF RANGE - DTC B1676
1. Check if vehicle has been jump started within past 2 weeks. If vehicle has been jump started, ABS is
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3. Turn ignition off. Disconnect 25-pin ABS control module. Install EEC-IV 60-pin Breakout Box (014-
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4. Turn ignition off. Measure voltage between breakout box terminal No. 25 and ground. If voltage is
greater than 10 volts, go to next step. If voltage is less than 10 volts, repair Red wire between ABS
control module and power distribution box/engine compartment fuse box.
5. Measure voltage between breakout box terminal No. 9 and ground. If voltage is greater than 10 volts, go
to next step. If voltage is less than 10 volts, repair Yellow/Light Green wire between ABS control module
and power distribution box/engine compartment fuse box.
6. Measure resistance between breakout box terminal No. 8 and ground. Also, measure resistance between
breakout box terminal No. 24 and ground. If both resistance measurements are less than 5 ohms, replace
ABS control module and repeat self-test. If either resistance measurement is greater than 5 ohms, repair
suspect Black wire between ABS control module and ground distribution.
NOTE: DTC B1676 will set if vehicle has been jump started.
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