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Old 02-26-2008, 11:48 AM   #1
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1977 29' Ambassador
Latrobe , Pennsylvania
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What? A 7 round plug??

We're going to look at a 1977 29' Ambassador this weekend and we're going with tow gear hoping to buy it. This would be our first camper outside of a pop up and our first AS. It's for sale at an RV dealer. They told us on the phone that AS used a weird 7 round plug and they don't know how you plug it into your car (currently have a 7 flat plug on our car).

Could someone here enlighten me? Do I have to rewire the AS plug to a modern 7 flat? Is there an adapter to go from an AS 7 round to a modern 7 flat? If so, where do I get it?

I need something to tow it home 2.5 hours this weekend (hopefully)

Advice, suggestions, etc all welcome! Thanks!
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Old 02-26-2008, 11:53 AM   #2
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Quote:
Originally Posted by Breiz
Could someone here enlighten me? Do I have to rewire the AS plug to a modern 7 flat? Is there an adapter to go from an AS 7 round to a modern 7 flat? If so, where do I get it?

I need something to tow it home 2.5 hours this weekend (hopefully)

Advice, suggestions, etc all welcome! Thanks!
You have to rewire the plug to the new flat 7 prong plug. It needs the wires changed from the old standard to the new standard, too.
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Old 02-26-2008, 12:51 PM   #3
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The dealer just emailed me a pic of the plug and now I'm really confused. It's just a plug with pins in it in the wall of the AS. There's no cable. What am I not understanding here?
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Old 02-26-2008, 12:51 PM   #4
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Quote:
Originally Posted by Breiz
We're going to look at a 1977 29' Ambassador this weekend and we're going with tow gear hoping to buy it. This would be our first camper outside of a pop up and our first AS. It's for sale at an RV dealer. They told us on the phone that AS used a weird 7 round plug and they don't know how you plug it into your car (currently have a 7 flat plug on our car).

Could someone here enlighten me? Do I have to rewire the AS plug to a modern 7 flat? Is there an adapter to go from an AS 7 round to a modern 7 flat? If so, where do I get it?

I need something to tow it home 2.5 hours this weekend (hopefully)

Advice, suggestions, etc all welcome! Thanks!
The round plug is not wierd, it was the standard in the 1970's. It is still used on 18 wheelers and can be purchased at truck stops. Since you have the flat plug on your tow vehicle, you can either change the tow vehicle or the trailer. You will need a wiring diagram of the old plug as it is different from the current standard.

There are some who believe that the round plug works better and does not fail from corrosion as easy as the flat type.

bill
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Old 02-26-2008, 12:56 PM   #5
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Quote:
Originally Posted by Breiz
The dealer just emailed me a pic of the plug and now I'm really confused. It's just a plug with pins in it in the wall of the AS. There's no cable. What am I not understanding here?
You need a cable with plugs on both ends, common in the boating world. Like this but with seven pin plugs on both ends: Trailer Parts Superstore - 4-Pin Coiled Nite-Glow Extension Harness #47045

Bill
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Old 02-26-2008, 01:28 PM   #6
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OK we're thinking if we buy an umbilical cord and put a 7 round on one end and a 7 flat on the other then we can use the cord as an adapter. Everyone agree this is a doable plan? If so, then I need to find out where I buy an umbilical cord and the plugs. Thoughts? Oh and I need it here in like 2 days


Thanks again, you guys are the best!
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Old 02-26-2008, 01:39 PM   #7
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Quote:
Originally Posted by Breiz
OK we're thinking if we buy an umbilical cord and put a 7 round on one end and a 7 flat on the other then we can use the cord as an adapter. Everyone agree this is a doable plan? If so, then I need to find out where I buy an umbilical cord and the plugs. Thoughts? Oh and I need it here in like 2 days


Thanks again, you guys are the best!
Yes, you can do that, it will make it more difficult for someone to "borrow" your trailer since the borrower will not have any trailer lights or brakes.

The cable is available at RV supply stores, such as Camping World as is the flat plug for the round plug you will need a truck stop or perhaps a well stocked auto parts house.

Bill
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Old 02-26-2008, 01:50 PM   #8
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This is what I was looking for earlier. Unfortunately, it come with the flat plug only: Jet Connex

Bill
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Old 02-26-2008, 02:59 PM   #9
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Advance Auto Parts at Mission and Lincoln has 4 7 pin round plugs in stock. You'll need that and a cable with a 7 pin flat that you can get from an rv dealer - Advance may have those also. That cable will have bare wires on the other end to wire your round plug to.
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Old 02-26-2008, 03:08 PM   #10
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Breiz,

Be sure to follow the very important suggestion from Bill above, and CONFIRM the wiring of your existing trailer connection.

I use the 7-circuit, round-pin, round body Pollack connectors on my tow vehicle and my Bambi. I have found these more reliable and less prone to corrosion than the original 7-circuit flat-pin Bargman connectors. But the flat-pins have been used very successfully by millions, and, as all connectors, are generally quite reliable when maintained.

A good place to start is: How to Wire your Car or Truck for Trailer Lights, which shows a wide variety of connectors and provides suggestions on installation and testing.

Tekonsha has a page describing 7-conductor flat-pin connectors and wiring on the site: http://www.tekonsha.com/files/wiringdiag.jpg

One website with diagrams of 'standard' wiring of 'round-pin' round body trailer connectors can be found at: trailer_wiring_diagram.

Also see, for example, sites showing 7-circuit connector wiring diagrams for various tow vehicles; for example: Marksrv.com 7 way wiring diagram page .

It is also critical that you not assume that wire color-codes inside multi-conductor cables are standardized. Always use an ohmmeter to trace each wire to the associated pin of the connector.

When you can confirm the circuitry of your trailer connector, then you can decide to change connectors or make a custom cable.

Post any questions on the site and you'll have plenty of good suggestions.

Regards, Marshall
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Old 02-26-2008, 03:44 PM   #11
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OK new info:

The dealer just emailed me and said she does have the cable for the AS, however BOTH ends on the cable are 7 round male ends. Why would they both be male? Looking at the pic she sent me of the 7 round receptacle on the AS body, it looks male to me.
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Old 02-26-2008, 03:50 PM   #12
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Breitz,
I see you're in Latrobe. I grew up in Greensburg, where I got my Bambi.

Ten miles from your home you can contact Carl and Alex, who used to be at Turner Airstream (until it closed) and are now at Airstream of Western PA (Ranger Trailer) in Greensburg, near the old ITE transformer plant in Southwest. Give them a call at (724) 837-2753 to discuss your needs and they may have a suggestion.

Also, on the etrailer site you'll find: Adapter 7 Way (Blade) to 7 Way (Round Pin) 37595 : Trailer hitch bike rack and trailer hitches - etrailer.com

Good luck,
Marshall
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Old 02-26-2008, 03:58 PM   #13
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I use the old 7-round. My father's trailers all have them, so it made it easy for me if I needed to borrow one of his big utility trailers or the car hauler to have the plug already installed on the truck. I keep a supply of adapters in my truck toolbox for hitching up to other things, just in case.
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Old 02-26-2008, 04:03 PM   #14
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Also see this thread on the forum which discusses a special 7-circuit plug on a late-60's era Airstream:

http://www.airforums.com/forums/f37/...pin-17761.html
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