I'll make the presumption that it was ok and running when you put it away last winter, so it sounds to me like a case of winter corrosion on your wire terminals. Clean, check and tighten all your connections (don't forget fuses) I'll bet that solves your problem. If it doesn't, then my next step would be to replace the positive and the negative cables going from your battery to the engine. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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