Originally Posted by QuickDraw
1976 tradewinds wiring from trailer to tow vehicle color codes do not correspond. How do i know what to switch? Trial and error?
This pic from the '78 Service Manual - One Airstream "Gotcha" - the pic is as if you are looking at the umbilical connection from the OUTSIDE...in other words, kneel down at the front of the trailer, look at the trailer connector from the outside (looking at the trailer), and the brake activator terminal (unfused) will be in the lower right corner. Ground will be slightly larger than the rest of the terminals at the center top and just below the square "guide" of the plug in. The running lights are the connection on the lower left hand corner looking at the trailer. Battery charge is the center connection. The other three, RH turn/brake, LH turn/brake, and Back Up can be quickly figured out.
Usually a problem with the lighting is a fuse, a problem with the ground system, or a problem within the umbilical. Do not overtighten the safety clamps (holding the wire bundles to the connectors) as interior wire damage could occur.
If you need to repair the umbilical or replace it do yourself a favor and get the newer type of umbilical (8') that has 10 gauge wires for the charge and ground, 12 gauge wire for the brake activator system, and 14 gauge for the rest.