Keep it simple! Lots of di-electric grease, keep everything sprayed down w/WD40 or equivilent, leave the hood OFF when storing ski (so it can dry out under hood), solder every joint, smear 1211 on every solder joint, use adhesive lined heat shrink on every soldered joint, and use more di-electric grease! If you ride salt all the time, re grease all connectors once a month or so for preventative maint.
Gil
ps-I spend 8 hours everytime I set one up so that there are no issues on the water and by spending 8 hours setting it up-I 'usually' don't have issues. lol