[maui44]

I have a 1977 911S. The alternator is less that 1 year old and I have a new battery.

The alternator light is staying on after car starts.

Is there a way to "bench test" or otherwise test the voltage regulator (external) to see if it is bad before I start the task of taking out the alternator?

FYI:

Battery with engine off measures 12.4 volts.

When car started voltage drops to 11.

Voltage regulator have 3 terminals:l DF (Black wire) D+ (blue wire) D- (brown wire)

Thanks,

Ron