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Old 05-10-2013, 11:58 AM   #29
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Originally Posted by jerryc41 View Post
Right, but I don't want to connect the hot wire to the ground on the brakes, and vice versa.

One wire from the B-A switch will go to power, and the other will go to one of the brake wires, but which one?
Go to Radio Shack and buy a cheap VOM, which is a volt-amp-meter.

It will also have a resistance measurement settings as well.

They are cheap, informative, andd you will wish you bought one 20 years ago.

When you have it, measure the reistance to ground from each wire.

The wire that says ZERO ( 0 ) is the ground. The other wire will be a low resistance in the order of one (1) ohm or so.

Ohm,is a unit of resistance measurement.

Now you can check AC, DC voltages and resistance of many things in your trailer as well as your tow vehicle and home.

Otherwise your question can go on and on and on, and all without an answer.

Andy
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Old 05-10-2013, 12:45 PM   #30
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Here's a picture of the wires. The cable contains two wires, a black and maybe a yellow. Each wire is connected to a red wire that runs to the brake drum. What I want to know is where to connect one of the wires from the breakaway switch.
The Service Manual shows a yellow wire running from the trailer connector to the brakes. That's probably one of the two I have at the wheels, but there's not much color left in it. The Manual doesn't show the black wire.
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Old 05-10-2013, 12:46 PM   #31
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Originally Posted by Inland RV Center, In View Post
Go to Radio Shack and buy a cheap VOM, which is a volt-amp-meter.

It will also have a resistance measurement settings as well.

They are cheap, informative, andd you will wish you bought one 20 years ago.

When you have it, measure the reistance to ground from each wire.

The wire that says ZERO ( 0 ) is the ground. The other wire will be a low resistance in the order of one (1) ohm or so.

Ohm,is a unit of resistance measurement.

Now you can check AC, DC voltages and resistance of many things in your trailer as well as your tow vehicle and home.

Otherwise your question can go on and on and on, and all without an answer.

Andy
Yes, they do come in handy, and I've had several for years. I'll give that a try.
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Old 05-10-2013, 05:56 PM   #32
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Yes, they do come in handy, and I've had several for years. I'll give that a try.
I posted a reply and two pictures, but I don't see them. Long story short, I used the meter on the wires at the brakes - the black and the yellow. Each one gave me a strong swing of the needle over to zero.
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Old 05-10-2013, 06:00 PM   #33
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Jerry, If I read your posts correctly, it looks like you are toying with the idea of connecting the breakaway switch to the brake magnet wires. That's not how the breakaway switch connects on my trailer. Not even close.
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Old 05-11-2013, 06:29 AM   #34
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Jerry, If I read your posts correctly, it looks like you are toying with the idea of connecting the breakaway switch to the brake magnet wires. That's not how the breakaway switch connects on my trailer. Not even close.
I'm surprised that Airstream wanted to keep the brake wiring and breakaway switch wiring a secret. 1973 wasn't that long ago. I think I'll just leave it as it is - unconnected - and let the new owner find someone who knows how to connect it. A week from tomorrow, it will be sold.
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