Was just looking on the net for an answer and do see where some are listed @ 20 V ac--- this is a briggs right?
Try running it @ 3600 and if it comes up to near 30V you are sure it is ok.
Educated guess is regulator is bad @ 5-6 V.dc output. that is awful low.
It would be good if, as a test, before you buy, you could substitute a known good reg.
I used a 3 wire like that from a kohler on a tecumseh till the correct one arrived and it worked just fine.
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