Sounds like you may have klilled the PGM with the wiring things, since a whining PGM is a very unhappy PGM - there's no speakers in there!



I haven't seen the wiring diagram for an MC18, so these are best guesses:

The kill switch should provide an Earth to the PGM so it'll be live (or high) when 'open' and short to chassis (or low) when closed. I don't know which of these states the PGM needs to work. Have you tried it in both?

Have you checked for 12v at the coil input leads?

Have you got access to, and know how to use an osciloscope?
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