voltage regulator entertainment

Your alternator really will not kick out 45v. Highest i saw on my old powermaster alternator was 18v at full charge. It could be something internally wrong inside the alternator, bad ground, high resistance in the bulkhead connections or connections to the regulator, could also be a bad grounded regulator.

45v will be wicked high current and about melt every wire in that charging system circuit very fast. let alone your battery would grenade.