At the "R" terminal on some later GM starter solenoids on specific vehicles is a yellow wire giving full battery voltage when cranking to + on ignition coil for easier starts.
Other vehicles has the "R" wire at the ignition switch giving full battery voltage while cranking:
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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