Ive got a 97 206 LXI with a Volvo Penta GS 5.7 and Im on the lake yesterday when we throw anchor to swim and eat. We get ready to leave and nothing happens when I turn the key, so I jerk the throttle lever back and forth while trying to start her,{this has happened before!} and it breifly tryied to start, and then it just clicked and stopped! Went back jiggled the battery cables, and it made 1 click again when I tried to start her, and went dead again. All accs. go dead, I mean everything goes dead after it clicks 1 time, but when I jiggle the positive terminal, it will come back to life until I try to start her, and it will click 1 time and all electric power will crap out until I jiggle the positive terminal and do it all over again. Before all this happened, the trim gauge was acting all erratic all day long. Not sure if this was a forewarning of an electrical prblem or what. Got towed back to the dock 20 miles away but felt pretty embarrassed since I always brag about my 97 Larson with 150 hours on her!!