I would turn the disconnect switch to off...
Then put a trickle charger on it over night and see if it will hold a charge. If it does, turn the disconnect switch to on and go for a drive... Otherwise keep the disconnect switch off, remove the battery, put in a new one, disconnect to on and go for a drive.. Other than that you will only have to reset the clock...
Then put a trickle charger on it over night and see if it will hold a charge. If it does, turn the disconnect switch to on and go for a drive... Otherwise keep the disconnect switch off, remove the battery, put in a new one, disconnect to on and go for a drive.. Other than that you will only have to reset the clock...