Originally Posted by AustinAir
Thanks to everyone who contributed diagrams and advice. I was able to use the Airstream diagram and color codes for the wires and look at the diagram on the Truck bumper and figure out which wires went where. The plug on the tow vehicle side had been converted to the blade type(berkman?) connection. Got home from Fiesta Bowl safely and with all lights and brakes working.
HOOK EM HORNS
You will find, in time, that the flat pin connectors are a "hazard" within themselves.
They easily corrode, one grain of sand
interferes with a connection, especially the brakes and charge line.
A little more expensive 7 way "aircraft type" connector, eliminates that problem, 100 percent, since they use round pins that self clean every time you plug in or out.
Soaking them in mud and sand, for weeks at a time, will not stop it from "connecting."
Of course, the flat pin is cheaper, but that's also what you get, namely, cheap, unsure connections.