Okay this is the second time this happened on the river. End of last boating season I was running full throttle and ski just cut out after about 5 minutes. Had to get a tow back as it wouldn't restart. Battery completely drained. Took to dealer and they said it's just needs a new battery. Buy a new battery and it started in driveway before putting away for winter. This past week... It started right up in driveway with hose connected. Let it run about 5 minutes. Okay I'm safe.... go to river and about 5 minutes at full throttle it dies again!! Just completely shuts off. It couldn't be another dead battery?! I tried starting to no avail. MY question is is there some kind of recharging system on the 99 GTI. Like an altenator for a car? Seems that the battery is being drained and once it's run the battery goes dead?! Thanks for any help......