QUESTION: I have wired my Alternator output directly to my House (primary) battery bank. It charges nicely when the engine is running,,,,no problems. WIth the engine off, the Alternator pulls power from the Batteries, drains them and gets very hot (110 degrees and climbing). Is this to be expected? or do I have a fault somewhere in my wiring. Some online research revealed I may have diodes in the Alternator's Voltage Regulator that were stuck open.....but it has happened to three different Alternators.