Is there a way to test an alternator with the external regulators on the bench? I can send one to be rebuilt for $60 but it would be cheaper for a customer if we can find a good used alternator.
Mario Vintage Werks resto
Testing external regulater alternator
Sep 20, 2006
2 Replies
Try this:
Connect a 12V bulb (brake light style) from battery (+) to the DF terminal. Ground the D- terminal. Connect the big B+ post to battery (+). No connection to D+ terminal.
Spin the alternator at ~1000 RPM or better. (You figger out how to do that :-)
See if battery voltage rises (no exact number...)
Speedy Jim
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Thanks Jim
It turned out to be a bad regulator, he was able to drive away today. This was a 73 with a sp engine and generator with a mess of hacked wiring.(might have had engine fire)
I replaced the complete main harness (used) and put a spacer under the carb to clear the alternator.
All said and done everything worked out well.
Mario Vintage Werks resto
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