Pertronix is a different case than an HEI. Depending on which one you have you may have eliminated the resistance wire or not. If you did replace the resistance wire with an ordinary wire, as one does with an HEI conversion, then you wouldn't need the yellow wire. If you have the type that just replaces the points, nothing else, then you still need the resistance wire and may still need the yellow wire for starting. May have to contact pertronix to find out. If you still need a full 12 volts at the coil during start, then the diode wire or a starter relay would work.
