quote Mumbles:
The mercury switch finds ground thru its housing and clamp screw, same as the choke solenoid does.
That does bring up a good point. Early models had problems with intermittent grounding of the mercury switch circuit due to reliance on making good contact through the throttle shaft gear which is loose enough to rotate freely. (Edit: A flat spring, #68 in the inset box, was supposed to make the shaft ground.) On later models, a ground wire was added between the mercury switch and steering bracket. Also, the steering bracket has a ground wire (#72 in the inset box) to the motor frame, which is not shown on the diagram. That ground is necessary because the steering bracket is mounted on the rubber mounts.
