This past weekend 15 minutes before weigh in my boat wouldn’t start. Cranking battery low due to live well and oxygenation use all day....plus 3 big graphs. No problem....I have the jump switch, right? Flip the switch and nothing....TM batteries were working fine. What could be the problem? BTW a good friend stopped and towed me in just in time for weigh in we were close to the ramp fortunately.