For your 1972 International Scout II we offer a 4-pole pigtail wiring harness kit that includes a circuit tester to allow proper identification of the function carried on each vehicle wire (wire colors are not fully standardized so testing is the way to go). I have linked a representative installation video as well as a video on how to use the tester.
This 4-pole can be used with mounting bracket # 18144 from TowReady. view full answer...