I dont like using a diode when wiring a 3 wire alt to an older machines ignition supply circuit. A diode will full field the alternator, adding 2-3 amps load to what may already be a marginal power supply to the coil. The added 2-3 amp load on that ignition circuit can cause voltage drop and poor spark for starting. Substitute a charge warning light for the diode. A charge light only adds less than 1/4 amp load on the ignition circuit, yet will excite your alternator at idle. The charge light is also a great indicator to tell you that the alternators field circuit is functioning and if the alternator is charging. Also a warning to remind you that you left the ignition switch turned on with the engine stopped. A #1815 lamp and two wire base works good for most applications and can be hidden or exposed.
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