I just picked up a nice 19 ft open bow boat with a 3.0 mercruiser and I found out the hard way that the alternator isn't charging. Will that cause it to run kindve crappy. It sat a little while we drained all the gas and put fresh gas and with a good charged battery it ran great tonight then after the radio was on and lights depth finder it slowly started breaking up and wouldn't go over 20mph. I'm thinking maybe the inconsistent voltage isn't giving proper volts to the coil. Any insight would be great thanks in advance Sent from my Z981 using Lake Ontario United mobile app