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Old 12-09-2014, 03:36 PM   #1
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1966 20' Globetrotter
Starkville , Mississippi
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I'm sure this is a stupid question but....

Hello from Mississippi. I just purchased a 1966 Globetrotter after looking FOREVER and now I am fired up to get this ole girl cleaned up and running.

I have installed a new 7 point trailer plug and "think" I wired everything correctly...but I have no brake lights or marker lights.

My question is do I need a functional battery in the GT to make the brake lights and marker lights work??

Right now there is an old dead battery still hooked up, I just have not changed it yet.

Thanks in advance for any input.
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Old 12-09-2014, 04:20 PM   #2
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a volt meter would be helpful

I am almost sure that you don't need a trailer battery for brake lights and marker lights. The voltage for those comes from the tow vehicle
I would test the voltages at the socket on the tow vehicle first. ( get someone to sit behind the wheel to check brake lights. )

There is only one hot wire going to each marker light. The ground is actually the mounting screw. I would check to see if they are loose, but if they all don't work, something else must be wrong. Fuses ? The plug on the trailer umbilical ? Wiring configuration ?

Wiring the socket on the tow vehicle can be confusing and it's easy to wire it wrong if you don't keep the correct perspective ( front and back side ) of the wiring diagram to the socket They are opposite if you look at the contacts of both, head on …...Hope I am not confusing things
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Old 12-09-2014, 04:28 PM   #3
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Hey Duct………..

I forgot to say that it was totally NOT a stupid question.
AND it shows that you are thinking. AND it shows that you are doing it yourself.
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Old 12-09-2014, 04:49 PM   #4
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one more thing.......

Do the turn signals work?
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Old 12-09-2014, 05:52 PM   #5
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The wires in the old Airstreams and new trailer plug diagrams are not the same - they use different colors in different positions - best do what mandolindave says and just check each wires function with a circuit checker and have someone stand behind and see if you got it right, if not try another wire. When I rewired my '75 AS, I had both diagrams - both old and new and just went from there - worked fine. I think I found the old diagrams from one of Andy's posts on this forum.
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Old 12-09-2014, 06:18 PM   #6
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Yup.....I discovered that when I wired my tow vehicle to properly operate the lights on our '66 Trade Wind. First discover which your trailer wires operate it's lights. then match them to the tow vehicle wires. I don't have my final diagram handy as I'm certain yours are the same. I'll check back here and if you are still struggling I'll post it.

Neil
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Old 12-09-2014, 06:54 PM   #7
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Use this diagram to check things out. With a volt meter, one end attached to the TV connection marked Ground, at the TV connection check to see that each function is at the correct location. If so make a short jumper from the Ground connection of the TV to the Ground connection of the umbilical cord. Now with another short jumper connect to each function at the TV connector and touch the corresponding terminal on the umbilical while someone activates that function. Any function that does not react is wired wrong in the trailer

You will not get a reaction when you touch the trailer battery terminal as there is no battery in the trailer at this point.

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Old 12-09-2014, 07:09 PM   #8
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1966 20' Globetrotter
Starkville , Mississippi
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Thanks SO much for all the response! I have interior lights and plugs that work but ZERO exterior lighting, no brake lights, no turn signals & no marker lights. I can't even get the porch light to come on. Going to change all the fuses. Also, the previous owner added an additional black and white wire that run under the belly pan next to the blue brake wire.

From what I can tell it looks like that is all connected into the brake wire between the 2 drums??

Should I wire that "new" wiring into the correct 7 blade wire spot or just use the original 7 wires in the umbilical cord?

Im going to start over and try again.

Thanks again!!!
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Old 12-09-2014, 07:18 PM   #9
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The trailer battery has nothing to do with the exterior traveling lights. It does service the exterior porch light and if that light is not working I would check the Bulb first and with a volt meter the circuit second.

It is quit common to add secondary wiring to the brakes to over come voltage loss in the wiring. The black wire should be the same as the original blue wire and connected to the umbilical cord as close as possible to the connector. The white wire is a ground wire and is most likely connected to the frame close to the tongue.
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Old 12-09-2014, 07:42 PM   #10
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Thanks Howie. the Diagram didn't come thru, mind trying again?
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Old 12-09-2014, 07:58 PM   #11
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Will work on this. For some reason the image will not post and the URL will not go into an e mail.

PM me your e mail address. I was able to e mail it to myself so I assume I can e mail it to you.
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Old 12-10-2014, 06:44 AM   #12
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Hi ductwrap. Welcome to the trials and tribulations of vintage Airstream ownership. And welcome to Air Forums. I have found a lot of help here through the years. And now I enjoy helping others where I can.

Here is the 7 pin wiring diagram out of my 66 Trade Wind owners manual. I replaced the umbilical cord on my 66. It is frustrating for a none experienced automotive electrician like me to figure out these 12v circuits.

NAPA and others sell a simple trailer lights tester. It plugs into your tow vehicle plug and shows LED lights as you power the different functions, left turn, right turn, brakes, etc. With this cheap tester, you know your tow vehicle is delivering voltage correctly, and which pin does what. I might be helpful to you.

I also included the trailer 12v wiring diagram. I believe you can see the three fuses in the back, as well as the 4 circuit breakers. Airstream used both to protect the 12v circuits. And both can cause an open circuit.

You really gotta keep track of the wire colors. Our old Airstreams have different wire colors than modern trailers and tow vehicles. It was mentioned the blue wire is trailer brakes. On my trailer it is a yellow wire powering the brakes. You can see this in the wiring diagram below.

Nope, you don't need a good battery, or a connected battery to run the external lights. You do need it for the emergency brakes to work. Don't tow without a good battery and your trailer brakes working. You never know.

You'll find the cause soon.

David
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Old 12-10-2014, 07:11 AM   #13
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It's me again! By the way, we Forum participants love pictures! I have had my 66 Trade Wind 24 footer for a little over a year now. It is two sizes bigger than yours. I have enjoyed spending all kinds of money on it. My wife, not so much! We have Airstreams with the goofy phillips curved glass windows. Airstream did this for 3 years before they came to their senses. So our trailers are unique in this respect.

I find the vintage trailers well built in my view. Plastics came more prelevant in the 70s and beyond. Our trailers have the dura torque axles just like the new ones have. And we have Alclad aluminum exterior skins which is a very good grade. Our trailers are pretty light weight for their size and tow nicely.

They are just old and probably need everything! One step at a time.

We would love to see your old Globetrotter.

David
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Old 12-10-2014, 08:34 AM   #14
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Welcome from another Mississippian just down Hwy 82 west from you.
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