Reply To: 58 Evinrude 35 Grounding Issue?

[David Stanton]

The Mercury switch is on the side of the motor about an inch from where the tip of the remote throttle linkage connects. You can see it without opening up the shroud. Some models have two mercury switches there – look for a small silver part with a wire coming out of it . This part moves (tips back) when you advance the throttle. It is a position sensing switch. When the throttle is set low, mercury inside the part electrically shorts the wire to it’s case , which is grounded via its mounting screw.
Dave