Re: Ignition switch swap out

[David Stanton]

Are you sure your motor is a 1957?

If it is a 1957, (Model RDE-19) – like Frank said, there was only a starter button so someone cobbled in a switch from something else.

There is an aftermarket switch that should work like the one in Frank’s 1958 diagram, but you need to know where your wires go to tell you how to connect it.. https://www.firstchoicemarine.com/p-21157.aspx?searchEngineName=sierra-ignition-switch-18-1801 It was designed to replace several different switches, so it has 5 terminals, but you have to know which four terminals to use and what wires to connect to them. Your existing switch is probably not stock, if it is, say a stock 1958 or somewhat newer switch, it is a double-edged key and there would have been a number stamped by the keyhole.

I suggest you locate a friend that has some knowledge of circuits and/or outboard igniton wiring that can figure out how your current switch is wired and guide you – without seeing your wiring myself, the advice above is all I can give.

Do not guess at this wiring or you will likely fry some wires and the new switch.
Dave