Re: mercury 175xr2 won't turn over
It sounds like simple problems have been complicated by jury rigged wiring to compensate. I'd rewire it to stock, replacing any failed components, like the ignition switch, and enjoy a reliable system.
As far as the present stuff goes, I've seen boats wired from factory with those durned clip on (insulation displacement) taps. In a marine environment, water, or worse yet salt water gets into the now unprotected metal, and with an electrical potential on it, it turns into a sacrificial anode and just disolves into an open circuit. I suspect the switch you talk about is wired in parallel with the start contacts of the ignition switch with just such wiring taps.
When you're rewiring, replace any such taps with soldered, and well insulated connections. Liquid electrical tape, and adhesive lined shrink tube go a long ways toward this end.
hope it helps
John
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