There are 2 variants of the 3 wire pigtail:
The first type is as follows (using all commonly used terminologies)
Red: 12v/Positive/+
Black: 0v/-ve/ground/Negative/-
Yellow: Data
The second type is:
Brown: 12v/Positive/+
Blue: 0v/-ve/ground/Negative/-
Yellow/green: Data
On the new 4wire pigtails, the order is as follows:
Red: 12v/Positive/+
Black: 0v/-ve/ground/Negative/-
Blue: Data1/Primary data input
Green: Data2/Backup data

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