Altenator conversion now overcharging help

[customcruiser72]

I converted my altenator tonight to the modern internal regulator from an 81 caprice. I followed the instructions posted in 2004. Now the battery is overcharging 17 volts at battery at high choke idle and the ammeter on the dash is on the high charge side and goes up with rpm. Just 20 minutes of test drive had the battery sizzling. The level goes down to 15.4 at low idle. Any ideas? Thanks in advance for any help. Truck is a 71
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