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Why is charge voltage fluctuating? - 2003 Pontiac Bonneville

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I have an 04 honda cbr f4i and when i first crank the bike it idles fine. i take off down the road and then bike starts cutting out until i get above 6500 rmp whats causing this please help me


the problem indicates a voltage problem to the ignition system
possible problem in the charge circuit or voltage regulator / loose wires or bad ground
Why I say this .--at idle the ignition system is stable as the increase the voltage to the ignition fluctuates causing the misfiring until you reach a point where the fluctuations are smoothed out buy the rpm
I would not suggest a fuel problem as it runs at high rpm which indicates that the fuel system is working

May 23, 2018 | Honda Cars & Trucks

1 Answer

Lincoln vantage 400 fluctuating amperage while idling. Could it be bad brushes or the motherboard ?


Could be a faulty voltage regulator internal to the alternator. May also be the charge gauge. Have the charging system tested. If voltage stays steady when tested, chances are a problem on the gauge side. If voltage fluctuates during testing, possible alternator problem and gauge ok

Jan 20, 2016 | Lincoln Cars & Trucks

1 Answer

Heya, few problems with my non turbo 3000gt. central locking completely stopped working, speedo flickering and battery charge showing random volts. garage thinks its alternator as battery light was fl


Based on the fact that there are many problems occurring that are in unrelated systems, voltage is one of the things that affects everything. If your voltage is fluctuating randomly, this is an indications of a voltage regulator problem. The voltage regulator for your car is internal to the alternator and is not a separately serviceable part. If the garage did am electrical system (charging system) test and recommend a new alternator, I would agree with the diagnosis.

Dec 30, 2014 | Mitsubishi GTO Cars & Trucks

2 Answers

Deville troubleshooting


Sounds like an alternator problem...or voltage regulator inside the alternator

Sep 08, 2014 | 2000 Cadillac DeVille

2 Answers

Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.


Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

Dec 12, 2013 | Cars & Trucks

1 Answer

Fluctuating voltage meter


Alternator maybe charging , but not enough to keep the battery charged which is causing the battery to drop charge. Most likely it's the voltage regulator inside the alternator. but regardless the whole alternator will have to be replaced. This will eventually cause the new battery cells to go bad.

Jan 06, 2012 | 2006 GMC Envoy

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...


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.

Mar 06, 2009 | 1993 Isuzu Trooper

2 Answers

2006 Chevy Silverado alternator intermittent charging


Perfectly normal.
Starting with the 2005 model year, light duty full size pickups and utilities are equipped with a new Regulated Voltage Control (RVC) system. This system reduces the targeted output of the generator to 12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy. The generator may exit "Fuel Economy Mode" if additional voltage is required. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.

Jan 03, 2009 | 2006 Chevrolet Silverado

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