bradford, one of the biggest reasons is your trim relays on your outboard. if the two way switch on the binnacle control were to go bad and give a constant up or down , possibly burn out a relay or trim motor before running battery down. was more of a problem when the trim switch was a seperate rocker swwitch on the dash.
that being said, i still haven't put an isolater switch on my v, so , what do i know...
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