Near Intersection of I-35 & I-90 Southern Mn. | On the 350 end, the red wire is 12V OUT to provide power for a real radar gun or hockey puck GPS that is not powered by some other means. The black wire is ground OUT for both a standalone radar gun or hockey puck and signal ground. The green wire is the radar signal IN from a radar gun or hockey puck.
Originally these wires went to a four pole AMP connector. Pin 1 was black or ground, Pin 2 was green or signal and Pin 3 was red or 12V. The fourth pin was sometimes used by certain monitors (not the 350) to inform them that a radar gun was actually present. This fourth pin was just the 12V from Pin 3 going to the radar gun but then making a loop and returning. Those monitors that used that trick then watched for 12V returning on Pin 4 to determine whether a radar gun was actually present.
In you stub cable to the tractor cornerpost, you have only a black and red wire. The radar or GPS on the tractor is already powered by the original tractor harness so the red wire from the 350 is not needed.
Decide which wire is going to Pin 1 of the cornerpost connector, that wire (likely red) will go to the green wire of the 350. The other wire will go to the remaining wire. The red wire on the 350 end will not be going anywhere. Since it will be 12V when the 350 is turned ON, it should be capped to prevent a stray short.
Edited by tedbear 5/20/2017 14:55
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Proper wiring for speed input on JD 350 CompuTrak?
