got a 1994 115hp Merc. the power trim unit does not work. i tried pushing the up/down button several times times, the motor powers up but the ram is siezed. I removed the 3 wire trim unit completely. when i reconnected the motor to the battery, there were sparks at the battery. tried turning it over but theres nothing. not even a click from the soleniod. I checked the fuse and it is still good. why is there a spark at the battery? do i need a new soleniod? starter? or did i fry the whole system?