Air Lift Load Controller - Dual 28315S8 Pigtail has simple red (+)

Pigtail has simple red (+) and black (-) wire hook-ups

1987-1989 Mazda B2600

1975-1978 Plymouth PB200

its been one of three options

Air Lift Load Controller - Dual 28315S8 Pigtail has simple red (+)Controlling Two Air Springs Independently; Control the pressure in your air springs from the cab of your vehicle; Heavy duty compressor; Install the system yourself in a few hours with the help of a fully illustrated easy to follow installation manual. ; Automatically senses low air spring pressure and immediately activates to maintain a safe pressure level.; All Air Lift compressor systems are compatible with any brand of air springs Air Suspension