Re: 1958 OMC Mercury Switch Wiring

[chris-p]

Crosbyman…..

The second switch completes the ground from the starter solenoid pull-in coil. It’s purpose is to prevent starting the motor at fast throttle settings as we know. Straight forward on that one.

The first switch completes the ground for the vacuum cut-out switch… which prevents motor run-away under no-load conditions like when you shear a drive pin. It only does that function at low throttle positions, however. That is what the mercury switch does, only allows that to happen when the throttle is at low. Otherwise, the vacuum switch would cause mis-firing of the motor at cruise to high throttle settings.

So perhaps that is why Wayne? Would they interfere? I’m not smart enough to know. Especially on a Sunday morning.