Starting problem solved (it seems). Wiring mistakes while converting the old Key + push starter switch to 3-pos keyswitch as follows:
a) Keyswitch ON post was connected to SOL +. Removed from SOL + and connected to COIL +
b) Keyswitch ST post was connected to BOTH SOL "S" and COIL +. Removed wire connecting SOL "S" to COIL +
Engine now starts but further work to come checking timing , adjusting idle setting (stalls if drops below ~1000RPM), plus other improvements.
The yellow cover "Atomic 4 Marine Engine" service and repair manual p48-49 revealed what was wrong.
Thank you so much for the helpful suggestions.
DonC
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