i recently obtained two 1971 31' sov. internationals they both require the round pin plug for the 12 volt
light wiring. Neither one of them match the wiring on my F-350 nor do they match each other! I have a bit of experience with this type of thing, but when I began testing the female plug on the coach, i have several pins that are direct to ground. I have been able to locate one trun/brake light, the back up lights and the marker lights. Not sure which wire is truly supposed to be the ground and where my other turn stop should be. ALso confused by the back up light thing. Never had them before and the current location should be the 12 volt
charge line i beleive. I would love to have a wiring diagram of what the trailer wire was supposed to be so I have a starting point. I have reviewed previous posts on the subject for several hours and found diagrams either too blurry to make out or found the websites referenced at airstream to be deleted and no longer available. Any assistance would be appreciated.