Thanks for the replies. I guess i'll just keep returning them until one works, then throw it in the trunk as a spare. I also might try the relay mod to trigger the voltage regulator. It seems much more efficient.
I had the same problem. overcharging with my powermaster 100amp alternator.
2 different MP blue regulators. 1st one the gel actually came out and down my firewall. then I bought one with a separate ground wire. no issues since.