Electrical charge / discharge eratic operation

[Derrick Brown <derrickb@xxxxxxx>]

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hi all,

Ive got an electrical question.  New car, so im busy finding all the 
NEW quirks  : )
63 Plymouth.  440.  Electronic Ignition.  Old style voltage regulator.
Ive driven it only a couple hundred miles and just today the charging 
system gauge started bouncing between discharge and charge at an 
irregular rate.
I noticed this first during the day time then tonight as well.
The guage appears more "stable" when out on the highway at a constant 
speed.

I can see the lights both dim then brighten again in time with the 
gauge going from discharge to charge.

No engine skip or miss nor power loss in the engine.

So...............

Voltage regulator?  ( anyone have a good test for this)

Alternator?  (belt doesnt seem to be slipping)

All connections appear fine.

Ballast Resistor?


BTW, i checked the voltage on the voltage reg, between the terminal on 
the adjustable side and ground.  13ish volts with lights on and looks 
to be about 7 ish volts with lights off.  is this normal?

Any thoughts?

thanks to all in advance.

derrick

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