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Hi there, The main battery wire on the alternator is connected to where at the other end ? Is that wire the original one that connected to the generator or a new wire that was fitted with the alternator conversion ? It might be charging the battery but not actually connected through the ammeter and therefore not reading a charge. With engine revved up above 2,000 RPM the voltage reading across the battery terminals should be approx. 7 volts to 7.4 volts if the alternator is working OK. Battery voltage at rest fully charged should be 6.3 volts. Your alternator would have a built in electronic voltage regulator. It is most likely a Delco alternator. Is it a single wire or a three wire connection on the Alt. ? Regards, Kevin.