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The OFF position on the key switch should ground and stop the motor.

See this diagram we have:
http://www.whalercentral.com/faq.php?...p?cat_id=8

Seems like you need to find a Black w/white stripe or a straight Black wire to connect to eh other "M" terminal opposite the Black w/yellow stripe.

Also see these for wire colors connected to the ignition switch:
http://www.whalercentral.com/articles...icle_id=72
http://www.whalercentral.com/faq.php?...p?cat_id=8