1994 Oldsmobile Cutlass low voltage

1994 OLDSMOBILE CUTLASS
135,000 MILES • 6 CYL • FWD • AUTOMATIC
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WILLIEC
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  • 1 POST
i have a 1994 cutlass supreme,whene driving over 30,voltage reads good ,when the car coast,it stays good until it drops under 10.someone told me it was a ground short,i changed altenator,new battery,cables,still have problem what can it be?
Dec 20, 2008 at 10:08 AM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
Hi:
Was there any change when you replaced the alt? To me it sounds like you have a bad voltage regulator. If I recall, they are built into the alt on your car. Have the voltage output checked on the alt and let me know what they find at an idle.

Also, do the headlights dim when the voltage drops on the gauge?

Joe
Dec 29, 2008 at 1:37 AM
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MOOK
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im having the same problem with my cutlass but my lights dim when the voltage drops whats the problem?
Jan 26, 2011 at 4:07 AM
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JACOBANDNICKOLAS
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  • 110,175 POSTS
It sounds like you have a loose belt or the alternator is going bad. Most parts stores will check your alternator free of charge, so I recommend having that done. They can do it on the vehicle and load test it.
Jan 26, 2011 at 11:41 PM
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MARLBORO93
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Im having problems with voltage I changed the alt and the battery and lights dim and bright and the voltage on the dash keeps going down and back up especially when using radio a/c etc what could it be bad ground? Or a voltage regulator? Any suggestions
Jul 31, 2016 at 8:42 PM