Lights pulse brighter/dimmer as revs go up?

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64DartGTinAZ

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Weirdness in the '65 273 Valiant

When I start it, all is normal

When I rev it up, the lights go dimmer/brighter/dimmer/brighter
When let off the gas, the lights go back to normal

Works the same whether headlights or just the dome light.

Anybody know what's going on here? Voltage regulator, maybe?

Thanks!

John
 
Loose fan belt

Bad alternator brushes

Then the usual bad bulkhead wiring connections
 
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