Haven't worked on one of them in many moons, but sounds like a bad rectifier/regulator. If it has factory trim and tilt, it should have a regulated charging system that should cut off around 14.8 volts. If the diode failed in it, it could allow it to back feed and drain your battery and cause the arc your seeing. You can try disconnecting the regulator and see if the arc goes away when you hook the power up. That would tell you if that is where your problem lies. I'll try and find some more info for ya.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
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