7-pin wiring diagram

Tom's RV Message Board: VAC Discussion List: Topics 0 - 9: 7-pin wiring diagram
By Littlejohn, Rich on Wednesday, October 27, 1999 - 12:39 pm:

connector to me. Have you towed other trailers using your existing tow vehicle plug and brake controller without any problems?

Nope, the tow vehicle plug and brake controller are brand new.


That all makes sense. Which leads to my next question- is there an online diagram of the 7-pin Airstream trailer connector?

By Packrat on Wednesday, October 27, 1999 - 12:40 pm:

Rich - Airstream color codes do not match the current 7-pin blade style color codes, if you remove the original and then hook red to red, etc, you will have some strange connections.

Here are the codes from my Argosy manual. These are for the tow vehicle plug looking at the plug end.

White - Ground - 6 o'clock
Blue - Charge Line - Center Pin
Brown - Right Turn and Stop - 4 0'clock
Green - Tailight and clearance - 2 o'clock
Red - Left Turn and Stop - 12 o'clock
Yellow - Brakes - 10 o'clock
Black - Backup lights - 8 o'clock

Don't know if these were the same for all years, but they do not match the current Pollak style 7 blade connector, that's for sure.

Albq, NM '77 20ft Argosy

By Don Horn on Wednesday, October 27, 1999 - 12:43 pm:


Below is a message that Charlie Burke sent recently showing the color codes Airstream used. Note that if you matched the colors of the trailer wires to the colors marked on a new trailer plug, you got it wrong, since the standard has changed. Decoding his message, if you hooked up blue to blue, you've got the charge line hooked up to the brakes.

Your new tow vehicle plug should have a diagram indicating the color and function for each pin, which should help. Just remember that the trailer side is a mirror image of the tow vehicle side.

I'd try checking your work against the color codes Charlie sent, and if that doesn't clear it up, start testing each pin individually for correct function and/or shorts.


From: Charlie/Betty Burke
To: airstream@airstream.net
Subject: Re: [a/s] Plug wiring diagram
Date: Thu, Jul 8, 1999, 8:56 PM

A word of caution about the wire color code for your 70 Airstream. The code Airstream followed from 1966 through 1981 was not the current industry standard code. In particular the blue was not the brake control line. This is the code for those years:

White = ground
Black = back up lights
Yellow = brakes
Blue = charge line
Red = left turn and stop light
Brown = right turn and stop light
Green = tail light and markers

Now having said that, if you are going to plug into a tow vehicle that is wired to the current standard you will have to switch three wires in the trailer plug to maintain compatibility. This is particularly fun will sitting in a campground making an adapter to haul another members '76 home when their tow vehicle died. Hoping not to confuse, here are the changes. Keep in mind the plug is labelled on the back by color not function.

Connect the Yellow trailer wire to the pin labelled Blu
Connect the Blue trailer wire to the pin labelled Blk
Connect the Black trailer wire to the pin labelled Yel


By Jim Dunmyer on Wednesday, October 27, 1999 - 12:44 pm:

Go to http://www.championtrailers.com and look in their tech area. Look for the diagram for the 7-pin, flat blade connector (if that's the kind you have). If you have one of the other ones, it might be there also.

Failing that, figure out which side of the hookup is easier to rewire, trace the OTHER one, then rewire the first.

Simple, huh? [grin]


By Don Horn on Wednesday, October 27, 1999 - 01:00 pm:


Just to make sure you go into overload, here's a diagram I made of my '65 Caravel's old 7-pin round (SAE) connector. If you've already pulled the wires out, the pin locations probably won't be of much help, but the color codes are the same as Charlie indicated. This diagram also matches the Argosy pattern that Art sent, so it appears we have a consensus. Or we will, if yours matches too. ;)


1 White--ground
C Yellow--brake
2 Blue--charge line
6 Brown--right turn & stop
4 Black--backup
3 Green--running lights
5 Red--left turn & stop

Below is the numbering diagram for the (old) trailer plug with 7 round pins. The detent or ridge on the plug housing is between at 12 o'clock.

4 3
6 C 5
2 1

By Littlejohn, Rich on Wednesday, October 27, 1999 - 01:51 pm:

Thanks for all the info so far!

I have the flat 7 blade style. What I'm really concerned about is the tow vehicle plug. I took my truck in to Allied Trailer in San Leandro,CA where the guy assured me that he "worked on Airstreams all the time", but after talking with him for a bit wasn't so sure.

Kept saying things like "I've never seen THIS before" and "Why do you want to put so much money into an old trailer like this." !!!

Anyway, they're the ones who installed the plug, and I could EASILY believe that they crossed a wire.

By Jim Dunmyer on Wednesday, October 27, 1999 - 01:52 pm:

I don't know what the color codes are on my A/S, I frankly didn't care. I wired the trailer connector with a hunk of 7-conductor "trailer cable" that has 2 #10s, 1 #12, and 4 #14s, using the "industry standard" color coding. THAT cable then got spliced to the trailer wiring in the little area near the step, through a hole in the bellypan. Naturally, I wired the receptacle on the truck to Industry Standard color codes and functions. In theory, I can tow other trailers and other tow vehicles can tow my A/S and everything will work correctly.

NOTE: There have been at least 2 different connectors used, the flat-blade and a round-pin style.


By Jim Dunmyer on Wednesday, October 27, 1999 - 01:53 pm:

It's likely that they wired the tow vehicle to "industry standards". You should probably rewire the trailer plug to match, but that's not absolutely necessary.