Thanks to all----I have no idea what caused the decline in voltage. It has sat longer at times and still cranked fine.
I will leave the trickle charger on it until the storm passes.
Not sure I understand the purpose of the battery disconnect switch. It is a momentary switch and each time I click it the green light stays on. This could be because I have it plugged into House, 30 amp circuit.
Marvin
PS, The reason I needed it cranked was to place heavy boards on the carport bottom rails and park the RV on one side and My heavy pickup on the other side.
This is so when Irma visits she wont take my CP home with her.