installing a Pazon ignition
instructions say take power from the white wire coming from ignition switch, got it. now can I tie into that white wire with another wire for power to the brake light switch?
If the bike is currently/was running points, there should be a White wire to each coil's "-" terminal, plus a separate White wire to the rear brake lamp switch.
As the White wires to the coils must be disconnected, the Pazon White wire should be connected to one of these. Insulate the other White wire terminal detached from a coil.
would stepping on the brake take power away from ignition
If you wire the Pazon correctly, it shouldn't do.
White wires are switched power to components from the ignition switch. If you wire the Pazon correctly, power to the rear brake lamp is not drawn through
The rear bulb brake filament (should) draw(s) less than two Amps, Pazon ignition even with two '6V' coils draws no more than 4 Amps; if the battery
cannot supply 6 Amps for the short period the lamp filament is on, the bike has an electrical problem nothing to do with electronic ignition.
Btw, the Pazon fitting instuctions' wiring diagram shows the Red wire from the "Ignition Module" and "Ignition Coil #2 +" terminal connected to "Chassis Ground/battery
Positive"; from experience, I advise strongly against the "Chassis Ground" option.