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Does one black/yellow connect to the key switch (M)
and then split to the kill switch?
So it's essentially the same wire?
Then the black/negative should be on the kill switch,
too a second M on the key switch.

m+m=shut off

Disconnect the kill switch wires and see if it starts.
Have them handy as touching them together will shut off.

Wow this reads more confusing than just doing it!

TP