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Old 07-29-2014, 11:05 AM   #1
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What is this wire for?

A large blue wire running from box to front of trailer but it was cut off in front.Click image for larger version

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Old 07-29-2014, 11:12 AM   #2
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The only blue I'm aware of is the charge line that goes from the tow vehicle to the battery.
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Old 07-29-2014, 11:19 AM   #3
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Well, in the movies, when there's a red wire and a blue wire, you cut one of them to keep it from going "Boom." Since your trailer didn't go "Boom" they must have cut the correct wire!

Sorry, when I saw the picture I couldn't resist…
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Old 07-29-2014, 02:28 PM   #4
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On my '62, if I remember correctly, the blue wire went to the trailer brakes.
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Old 07-29-2014, 02:39 PM   #5
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Quote:
Originally Posted by Protagonist View Post
Well, in the movies, when there's a red wire and a blue wire, you cut one of them to keep it from going "Boom." Since your trailer didn't go "Boom" they must have cut the correct wire!

Sorry, when I saw the picture I couldn't resist…
Pretty sure it's the green wire.... no wait the yellow?
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Old 07-29-2014, 06:56 PM   #6
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The attached diagram shows where the blue wire goes to the electric brakes.
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Old 07-30-2014, 12:45 PM   #7
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Thanks, so it's either the brakes or the charge?

The more I work on things the more mysteries I find!
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Old 07-30-2014, 01:22 PM   #8
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On my '63, EVERY ONE of the 12V wires were blue and all tied together as a single circuit.

The brakes were yellow and black. All of the wires for exterior lights were black.

Standards? not so much back then.
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Old 07-30-2014, 01:28 PM   #9
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Typically, in the umbilical cord, blue is for the brakes. Black is the charge, and white is the common/return/ground. However, in 1968, Airstream did not follow the current standard used for umbilical wiring. And if a PO re-wired things, pretty much anything goes.

Got a volt meter or test light? See if the blue wire has +12 VDC on it. If it doesn't, it may be for the brakes, but the only way to know for sure is to physically trace it and see where it goes.

Do you have a blue wire that connects to the brakes under the trailer? The current standard is to have a blue and white wire connecting to the brake wires. The brake wires themselves (coming out of the backing plate) may be blue and white or red and white. If you have a blue wire from the trailer connected to the brakes, to test to see if the blue wire at the tongue is connected to it, disconnect the blue wire from the brakes and check for zero ohms with an ohm meter between the two ends of the blue wire. If you have zero ohms, it's the same wire. Don't forget to re-connect the brakes after making the test.

Chris
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Old 07-30-2014, 03:18 PM   #10
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On our '66 Safari, that blue wire is the charge line.
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Old 07-31-2014, 04:30 PM   #11
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Thanks so much for info, I'll do done testing when I get back. We're hiking Grand Canyon!
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