I thought my five year old house batteries were going bad and so I bought a new pair. Mistake. The new batteries went dead in two days also. I then took out the 3-amp fuse for the warning devices, left inverter/charger off of course and just to be sure I flipped off the circuit breakers. I.e., Should be no electrical drain. Charged the two new batteries and again dead in two days. What/How do I test/check to discover and fix what is wrong with my electrical system? Dave