The Ford style solenoid is only a problem if it has been replaced with an actual Ford solenoid, because one of the solenoid coil terminals is the mounting bracket. The OMC and it’s Sierra replacement look like the Ford solenoid, but are different inside where the mounting bracket is not connected electrically to anything. The 2nd coil terminal is another small screw-thread terminal on the OMC.
Ford solenoids for cars with ignition points of the 1950s and 60s era also have two small terminals, but one is an internal relay contact that bypasses the resistor in series with the ignition coil while cranking for a hotter spark. Wiring these Ford solenoids like the OMCs that look the same will give you a burnt wire to the mercury switch on the throttle, that keeps it from cranking if the throttle is too high. There is no switch on the gearshift (that came along some years later if I remember right), so these old motors will start in gear, but only at an idle.
Note that Ford engines in older ski boats likeCorrect Craft that have breaker points, have the actual Ford solenoid with the resistor bypass while cranking.
