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I have a new ignition switch for my 53 m37 the Aand C got to one 625A. the B goes into a double 624 and 625,and the D goes to another 625A.
here is my thinking correct me if I'm wrong ,which is quite often...the D goes to distributor...the A and C go to 11 which goes to circuit breaker and horn....the B goes to 27 which goes to the spider harness .I have one extra,dont know which one is 27,(624 or 625)and why is there an extra one.

Typically you get three in a keyswitch power, ignition, accessories and starter. power hooks to 11 from the volt regulator, ignition is... I forget, but the one to the distributer and the accessories is a good choice to go to the spider harness. Starter is unused.

Hope this helps.

-jim lee