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Old 04-20-2018, 08:20 AM   #1
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1983 31' Excella
Holden , Massachusetts
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Brake wiring diagram

When we bought our 1983 excella the wires to the brakes were broken. No big deal, mechanic for 40 years, but when I repaired them the brakes locked as soon as I plugged into the truck. I found that the previous owner had replaced the trailer harness with no regard for color code. So I am looking for the wiring diagram. The lights are easy but need to figure out brake and main power.

Thanks
Jon

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Does anyone have a copy of the airstream service manual ? Apparently the 80s are an issue to find
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Old 04-20-2018, 10:12 AM   #2
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2002 30' Classic S/O
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Wiring varied over the years. Examples:
https://www.ajtnt.com/7-way-rv-plug-diagram/
and
https://www.etrailer.com/question-136117.html

Note that the color codes and pin positions are different between these two sources.

Best bet is to use a meter or test light to confirms what is coming from the truck and wire the trailer accordingly. The only truly common thing I am aware of is Blue is for brakes.

Al
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Old 04-20-2018, 11:01 AM   #3
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Quote:
Originally Posted by Oldwrench View Post
When we bought our 1983 excella the wires to the brakes were broken. No big deal, mechanic for 40 years, but when I repaired them the brakes locked as soon as I plugged into the truck. I found that the previous owner had replaced the trailer harness with no regard for color code. So I am looking for the wiring diagram. The lights are easy but need to figure out brake and main power.

Thanks
Jon

PS
Does anyone have a copy of the airstream service manual ? Apparently the 80s are an issue to find
I made this diagram when I had issues with my 2007.

http://www.airforums.com/forums/f37/...ng-137679.html
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Old 04-20-2018, 11:17 AM   #4
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1983 31' Excella
Holden , Massachusetts
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Thanks for the response but actually tow harnesses are standard brown is running, green and yellow are brake and turn, lt green is back up, blue is electric brake, red is tow vehicle power, and white is ground. What I am trying to figure out is where in the fuse box do the electric brake and tow vehicle power connect.
Thanks
Jon
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Old 04-20-2018, 11:28 AM   #5
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Tow vehicle power connects to the positive bussbar. Your choice which side of the disconnect switch. Blue brake wire from the TT, at least in my trailer, is not in the fuse box, but in a Barqman black plastic junction box near the fuse panel.

If you are talking about the power to the breakaway switch, it is often connected direct to the battery through an inline fuse, but sometimes connected to a fuse in the fuse panel.

On the other hand, the 1983 Airstream TT manual shows the 7-way connected in the fuse box. See page U-6.
https://www.airstream.com/service/ma...ear_select=879



Al
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Old 04-20-2018, 02:09 PM   #6
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First check your TV to be sure brakes are connected to terminal #2. Test with a meter while someone applies the brakes. If that checks out OK. Then apply trailer battery power to terminal#2 on the trailer and the brakes should come on.

If the brakes are coming on while there is no signal from the TV brake controller and the TV is connected you have a wiring problem in the connector or the trailer.

Trailer brakes go directly from the umbilical cord to the brakes without any fuse or other connection in the trailer.

The wires in the umbilical cord and the TV connector are very closely together and often cross connect to one another. Open the connectors and inspect. I like to solder these wires to improve the connection and prevent shorts from movement.
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