Boost solenoid (s) are not polarity sensitive.
Wire 1: +12V
Wire 2: GPO (GND)
Solenoid for boost control (MAC 35A-AAA-DDBA-1BA), +12v, 19Hz. Product link (ID: 864)
Solenoid for boost control (MAC MAC-46A-AA1-JDBA-1BA), +12V. Product link (ID: 1130)