Re: 1972 C20 will not start/seems like no electic power
>>I followed the purple wire from the ignition to outside the firewall (0.9v)<<
Inside the firewall connector, that purple wire goes to the Neutral safety switch and from there to the Ignition/Start switch which is where it gets its 12 Volts for the starter solenoid.
My first check would be the Neutral safety switch for voltage on both terminals with key in "start".
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'67 GMC 2500, 292, 4spd, AC
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