If you do this, there will be no resistor for the coil, I don't know if it would even work. The SIMPLE way would be to look at the alternator, should be a green and blue wire. Pull off the blue wire, and feed 12V from the battery TO THAT WIRE. The alternator won't charge, but you will have the coil ballast resistor all in circuit that way.

I assume you know how to jump across the starter relay.