I didn't see any mention of an electric brake line???????? Yellow is usually the auxilliary wire for "extras" like back up lights on your Airstream...Good luck. Do you have a book to tell you typical setup?

The wires coming out of your A/S are the key--match them to your pigtail that goes into your tow vehicle. The colors will not necessarily match---white to white; red to red; blue to blue, etc.

Curious to hear how you came out on this problem as it's been a continuous source of headache for me too!!!

kaybear49@hotmail.com
27' 75 Overlander