rebuilt 87 115 merc flawless for almost 3 years of predominant salt water.3 days ago no start..finally caught took it home..changed shifter cables...hooked batt back up...tilt ok crank ok...added h20,ran it, went thru gears, aok..plans for short run ..trimmed up...tried down ...nada...no crank ..no gauge..no tilt..all other power works. whats loose or corroded...test lite has been everywhere..seems good