new ignition switch question

[macibell111]

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.

[jim lee]

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