My merc 90hp 2 stroke started fine at the dock then drove for about 2 miles then beeper went off and rpms went to zero! Every time I try to hit the throttle the beeper went off...had water coming out off the motor jus fine and it wasnt shaking or anything plus brought the battery way down to 7 but built back up as I set still...batt was fully charged night b4.. 2012 Sun tracker pontoon ...thanks in advance