Honeywell MX7 Reference Manual page 52

Wiring color codes for Honeywell supplied DC input power cabling:
4. Provide mechanical support for the cable by securing it to the vehicle structure at approximately one foot intervals,
taking care not to over tighten and pinch conductors or penetrate outer cable jacket.
5. Refer to the following sections to complete the power connection to the MX7 vehicle cradle.
4-16
Vehicle Supply
+12 VDC
Return
Vehicle Chassis
Wire Color
DC + Brown
DC - Blue
GND Green