63 Dodge Dart, now let me see;)

Hi guys, I got my Distributor setup from Ray :thumbsup:, it's the bye bye to the stock ecm and hello HEI~ Ray made it easy to install, just a few wires and POOF :thankyou: :thankyou: ! Done! Now if I could just get the one more thing to re-install my int/exh manifold~
Merry Christmas;)
dne'

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Whats the second wire on the neg side of the coil for?