Power Trim & Tilt and in gear protection controls
I have a 150hp Optimax, Mercury engine, which recently developed an intermittent starting and trim fault.
Chasing and testing wiring I found a corroded link on the ignition barrel, to one of the two wires going into the back of the throttle/gear system. The two ends had been rubbing together intermittently, and my poking around dislodged them.
A new bullet connector solved that problem - and tests at the moment show she is starting and running fine, and the trim and in gear protection is working.
However, given that the problem was intermittent, I want to be sure I have actually fixed it - and I'm confused!
Going into the back of the control box is two wires, both of which then go into the ignition barrel (this is where the break was). I can't find any more wires coming out - just the throttle cable, and the gear cable.
I can't see how two wires can control in gear starting protection, up tilt, and down tilt - to my mind that needs at least four.
Am I being blind and missing the trim wires, or is there some sort of clever system at play here?