A-26A414-AI Primary Wire, 100', 14 Ga. (BLU)One New Aftermarket Replacement Primary Wire 14 Gauge, 100 Foot Roll, Blue This 14 gauge blue primary wire is a general purpose stranded copper conductor used for point to point low voltage electrical wiring, circuit repair, and accessory installation on tractors, combines, farm equipment, trucks, trailers, and other agricultural and construction machinery. The blue color coding helps with circuit identification during wiring repairs and harness work.