Battery Voltage Testing with Mechanical Voltage Regulator. There have been discussions about how the old style mechanical voltage regulators have the vehicles electrical voltages changing so quickly that you can see it with the headlights flickering from a lower output to a higher output and back and forth when the internal points and relays inside the voltage regulator open and close.
I decided to do a test with my car which is a low mileage 1968 Chevy II Nova with the original external voltage regulator and the original 37A alternator. The wiring in the car, except for the battery cables is original and while 50 years old it is in decent to good shape. In other words well maintained and preserved.
My tests do not show spikes occurring although there are voltage fluctuations, they are gradual.
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