Checked my chassis battery 1 week ago and it was at 12.17 vdc (with the neg. lead disconnected), today I checked and it was at 11.88. Is this an expected drop? Battery is 2.5 years old. I checked the ...
Even with a battery disconnect, there are still phantom loads present. CO detector, LP, the disconnect relay, etc. The only way to truly disconnect a battery is to lift a lead from the battery.
Even then a battery can self discharge 2% a month.
How could you check amp draw if it is disconnected?