voltage jumping around

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Jun 2, 2012 | 10:17 AM

Larrys69

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8th Gear

Joined: Mar 2012

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From: ga.

voltage jumping around

my voltage is jumping around from 2 to 13 volts.Had alternator checked its good.The car is a 69 should it have an external voltage regulator or internal regulator and would it make a difference.Checked ground wire good and tight.Battery only drains when running.Any suggestions would be very much appreciated.

Jun 3, 2012 | 08:58 AM

KenSny

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From: Olmsted Falls, Ohio

Without knowing the model number of the alternator we cannot tell if it has an internal regulator or not. If it is the stock alternator (still would like either a pic or a #) then I believe the regulator is external.

Alternator checked by a mechanic? Then he should know the regulator answer, and if external he should have checked that also.

Jun 3, 2012 | 10:23 AM

69 Chevy

Melting Slicks

Joined: Aug 2008

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From: Lehigh county Pennsylvania

'69 was the first model year to have the internal regulator.

Jun 3, 2012 | 10:39 AM

KenSny

Melting Slicks

Joined: Apr 2001

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From: Olmsted Falls, Ohio

Quote:

Originally Posted by 69 Chevy

'69 was the first model year to have the internal regulator.

Thanks, I stand corrected, I could not remember when the change took place.

Jun 4, 2012 | 01:30 PM

Larrys69

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8th Gear

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From: ga.

thanks for the help!

Jun 4, 2012 | 01:39 PM

Mike Ward

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Quote:

Originally Posted by Larrys69

my voltage is jumping around from 2 to 13 volts.

'69s don't have voltage gauges so how have you determined this?

Jun 4, 2012 | 01:53 PM

Larrys69

Thread Starter

8th Gear

Joined: Mar 2012

Posts: 8

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From: ga.

placed volt meter on alternator and battery with car off and it holds a steady 12.70 volts.I start the car and perform the same test and the voltage starts jumping around.What caused me to check was the car battery drained when running but holds the charge when not running.Auto parts store said alternator checks good.