Question about 2001 Pontiac Bonneville
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
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
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
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
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
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