You won't use the start terminal of the ign. switch either.

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The 3 terminal switch does not have a start terminal.
Bill your switch diagram shows four terminals with IGN 1 and IGN 2. Was this the switch used with key start without foot stomp?

~ Rasman
1971 Chevy C10
"Old Yeller"
Saga: "'Old Yeller' ... More than a Pristine 1971 Chevy"
1959 Chevy 1/2-Ton
In the Legacy Gallery