i recently bought a pre-owned javelin fish & ski boat. i have used it twice and both times the power trim switch has gone haywire. sometimes, not all the time, when i turn the main power switch on the motor trims down and stays on in the down position. sometimes it doesn't. the only way to stop this is to switch my main off or (here is the haywire part) i flip my trim switch up. sometimes when i flip my trim switch up the main power light comes on. any clues?