Re: MSD with 3 prong starter
There is ignition power when in the START position. The reason the yellow wire was added between the starter solenoid (R teminal) and the + (positive terminal) of the coil, id to aid in starting the engine with a full 12 volts vice a reduced voltage via the resistive wire.
By disconnecting the purple wire at the solenoid and testing the resistive wire, or new additional wire, with a DMM or a test light, one can see if ignition voltage is given from the ignition switch when in the START position.
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