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Old 08-07-2017, 07:40 PM   #1
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1969 25' Tradewind
springville , Indiana
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What is going on with this wiring configuration.

I just got a 69 tradewind, and it seems like an odd wiring scheme. It has no Air conditioner. There is a standard AC 3-prong 15A plug in the rear hatch, a 30A breaker in the bathroom, and a 20A breaker up front that seems to control everything. What's going on here? What is this thing actually wired for and what is the 30A breaker for? Did these all have a rooftop AC at some point and the 30A was for the AC and the rest of the camper was on the 20A? Did someone change the plug to a 15A at some point and it used to have a 30A? I'm stumped. Any help would be appreciated.
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Old 08-07-2017, 08:14 PM   #2
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The 30 amp breaker is the "Main" circuit breaker. The shore power cable (black wire) is wired to the 30 amp breaker which in turn powers the buss in the distribution panel.
The 20 amp breaker protects the items inside the coach. Not sure how many devices are located in the coach.
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Old 08-08-2017, 05:11 AM   #3
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1969 25' Tradewind
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Quote:
Originally Posted by TG Twinkie View Post
The 30 amp breaker is the "Main" circuit breaker. The shore power cable (black wire) is wired to the 30 amp breaker which in turn powers the buss in the distribution panel.
The 20 amp breaker protects the items inside the coach. Not sure how many devices are located in the coach.
Did these come with a standard plug back in the 60s? I assume the AC would have been on a separate breaker up front.
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Old 08-08-2017, 07:19 AM   #4
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Not sure what you mean by "standard plug". There is a plug designed specifically for 30 amp 120 volt RV service. You coach should have been equipped with this.
Not sure if your coach was originally equipped with AC.
The size of the AC should not require a circuit breaker larger than 20 amp. The wire size supplying power to the AC is what determines the breaker size. 14 gauge = 15 amp. 12 gauge = 20 amp.
The AC should have it's own breaker.
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Old 08-08-2017, 01:34 PM   #5
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Originally Posted by Isaiah View Post
Did these come with a standard plug back in the 60s?
The connectors have changed over the years. Some early trailers used a nonstandard connector that is now impossible to find parts and mating connectors for. By the late 1960s Airstream was using the 30A 120v "travel trailer" connector, now called a "TT-30" and still the standard for 30A RV shore power.

Much newer trailers have a twist-lock connector, which allows the cord to be removed.

Quote:
I assume the AC would have been on a separate breaker up front.
Probably, who knows.

FWIW it would be rare indeed that the original shore power wiring had not been modified at some point.
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Old 08-08-2017, 06:23 PM   #6
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The power cord in the bumper compartment goes to the 30a Breaker in the bathroom.

From there the main wire runs back around the bathroom to the curb side where it goes into the wall and up to the ceiling and runs forward to the front breaker box.

The power is then supplied to the 2 circuit breakers, 1 powers all the outlets and the Univolt. The other breaker powers the outside outlet and the bathroom outlet in the overhead medicine cabinet . If factory equipped with a/c it would also be powered by that line.

In my project I ran a 3rd breaker from the front box and ran a line to the a/c I installed.

Take look at your other thread for what I did about the water damage .
http://www.airforums.com/forums/f36/...-170889-2.html
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