I might as well use current forum rather than initiating a new thread.
Problem with Rostra 250-1223 documentation:
1. Diagram on page 21 for 'Normally Open Control Switch' is incorrect. In my opinion "ON" and "OFF" markings should replace each other. Image 1:
Else it will contradict the Open Circuit Control Switch behavior depicted in a table on page 23. Image 2:
Note: above image is a depiction of Rostra Cruise control switch(es). Mitsubishi stock switch is a slight variation, however we can use above image to ascertain that Mitsubishi switch can be used as open circuit control switch with minor changes.
2. General Wiring Diagram on page 21 explains wire 1 (RED/BROWN) as being sourced from + brake. Where infact the diagram explains it to be connected to Brown Wire of the control switch. Brown wire of the control switch returns +12v when the control switch is in 'ON' position. Image 3:
I cannot confirm for Rostra control switch, but when using Mitsubishi stock control switch, it should be connected to wire which has +12V when the cruise control switch is in 'ON' position. (Blue-Orange wire in Mitsubishi wiring)