The interlock switches are used in different circuits. Best advice is to look at the wiring schematics for each function to determine which switch and contacts are used.
Engine crank uses one side of the brake switch and a pair of contacts on the PTO switch
PTO start uses three contacts on PTO switch, one seat switch, reverse relay and reverse switch
PTO run uses same PTO switch contacts, but current flow is different after relay is energized.
After 20 years, I replaced all the switches, cleaned the terminals due to intermittent start and PTO operation.
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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