Good point with the fuse size. I haven't found any 50amp blade type fuses at the local AutoZone. Maybe I should try Napa. I've measured the sensing wire on the VR (at the alternator, it's the blue wire) and it shows the same as the battery voltage (now at 11.5 volts). I realize that should be enough to cause the alternator to put out max voltage to charge the battery, but shouldn't it be limited to 14.5 volts or so, and not the 34 to 70 volts I'm seeing?