The update:
The reverse switch has been jumped/disabled. PTO switch works fine otherwise (Im going to leave the reverse switched).
So seems that the ignition switch might not be making contact for turning it over (starting). Lights and run positions work fine.
Off looking for a wiring diagram to troubleshoot this switch.
.................................................. .........
Ok wait a minute.
Putting in a known good switch - no go.
The 'switch' lug of the solenoid does not get 12V when the switch is turned.
So suggests something between the switch and the solenoid - an open wire or a grounded wire.... PTO works, but wondering if the PTO switch (or some other safety switch) might 'partially work' - that is the terminals that switch the PTO make contact but some other terminal doesnt.
If grounded it should pull the ammeter down - will check that next.
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