The pink wire is as an ignition input sensor used to control the operation of the main engine relays contained within the Haltech Fuse Box. It needs to be connected so that it sees 12V only when the ignition switch is on and during cranking. This wire does not draw a large amount of current (< 0.5A). Do not connect to the accessory output of the ignition switch.
Note *² Can use 75A circuit breaker