1994 Oldsmobile Cutlass low voltage

WILLIEC

MEMBER
1994 OLDSMOBILE CUTLASS
6 CYL
FWD
AUTOMATIC
135,000 MILES

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?

Saturday, December 20th, 2008 AT 10:08 AM

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 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

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Monday, December 29th, 2008 AT 1:37 AM

MOOK

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3 POSTS

Im having the same problem with my cutlass but my lights dim when the voltage drops whats the problem?

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Wednesday, January 26th, 2011 AT 4:07 AM

JACOBANDNICKOLAS

MECHANIC
109,755 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.

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Wednesday, January 26th, 2011 AT 11:41 PM

MARLBORO93

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1 POST

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

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Sunday, July 31st, 2016 AT 8:42 PM