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volt meter

ok, here's one for you.
my voltmeter is pulsing from 12 to 15 volts about every 0.5 seconds. this is independent of engine revs. I also hear ( or think I hear) a soft ping from the passenger side of the engine bay, which is synchronous to the guage.
The alt is new, belts are new as of three weeks ago and has been perfect until today. I have MSD 7AL and coil. the engine sounds great throughout the rev band and there are no misses.

Any ideas?
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