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Old 01-19-2013, 05:33 PM   #1
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1959 24' Tradewind
Quantico , Virginia
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Break away switch?

Break away switch: Hi, trying to install this old style break away switch on our '59 Tradewind. This model only has two wires. I attached one end to the trailer battery + terminal and the other end spliced into the blue brake wire on the 7 pin connector. Keeps blowing the 30A fuse. How are these older breakaway switches supposed to be wired?

Breakaway Switch
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Old 01-19-2013, 05:44 PM   #2
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You Are Trying to Run a Hot Wire Straight to Ground!

The breakaway switch is... well... a switch.
On a switch you only wire into positive side (the hot side) of a circuit.
A breakaway switch is wired in line with the 12 volt DC brake wire.
The breakaway switch itself is grounded to the frame.
When the breakaway switch is inserted, the switch is open.
When the breakaway pin is pulled free, the switch is closed.

I'm happy to know your fuse panel works.
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Old 01-19-2013, 07:46 PM   #3
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Sounds to me like you have it connected correct unless pin 7 is not the brake wire.

On mine pin 7 is the back-up lights, I Think the brakes are on pin 2 and a blue wire.

You can't know for sure unless you test each pin to verify what pin the brake wire goes to your trailer.
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Old 01-19-2013, 08:55 PM   #4
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The breakaway switch is a normally closed switch, which is held open by the pin inserted in the front. According to your description of how you wired it, you have it wired correctly; IF the blue wire is actually the brake wire.
Do the brakes work on this trailer? When connected to the TV.
You should check to make sure the blue wire is not grounded somewhere. Also verify that it is fact the brake wire.
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Old 01-19-2013, 08:59 PM   #5
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Quote:
Originally Posted by Alumaholic View Post
The breakaway switch is... well... a switch.
On a switch you only wire into positive side (the hot side) of a circuit.
A breakaway switch is wired in line with the 12 volt DC brake wire.
The breakaway switch itself is grounded to the frame.
When the breakaway switch is inserted, the switch is open.
When the breakaway pin is pulled free, the switch is closed.

I'm happy to know your fuse panel works.
Thanks. I would have thought to check the ground of the switch it's self.
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Old 01-19-2013, 10:12 PM   #6
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The switch is not really grounded. It's just bolted to the frame. There is no electrical connection to the ground/common circuit in the trailer.
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Old 01-19-2013, 10:17 PM   #7
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What 30 amp fuse is blowing?
in TV?
in trailer?
inline to the breakaway switch?
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Old 01-20-2013, 08:18 AM   #8
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Break away switch

Quote:
Originally Posted by Wazbro View Post
What 30 amp fuse is blowing?
in TV?
in trailer?
inline to the breakaway switch?
Hi,

My trailer battery has a 30 amp in line fuse installed between the battery's negative terminal and the ground point.

Trailer brakes work great when hooked up to the tow vehicle.

I've connected one wire on the breakaways switch to the blue wire on the brake system (cable) and other wire to the + terminal on the trailer batt. When I pull the break away pin the fuze on the negative terminal blows.

Is this fuze even required? Should I just take it out of the equation and and try pulling the pin again? Isn't it odd to have an inline fuze on the negative terminal?

Steve
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Old 01-20-2013, 08:28 AM   #9
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The blue wire is the correct brake wire for a '59 Tradewind. Measure the resistance of the blue wire to ground to be sure you don't have a short that only shows up at full voltage. Your brake controller usually doesn't put out the full 12 volts. You might have a brake magnet that shorts out when fulling pulled in. Normal resistance for one magnet is around 3 ohms.

Also, see if the fuse blows when you disconnect the brake controller. The brake controller wiring might be part of the problem.
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Old 01-20-2013, 09:14 AM   #10
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Is this fuse even required?
Well it may have saved your wiring from melting and setting your trailer on fire.

Should I just take it out of the equation and and try pulling the pin again?
No your brakes should not be drawing anywhere near 30 amps

Isn't it odd to have an inline fuze on the negative terminal?
Yes it is odd, but not for Airstream and many Airstreams have a 50 amp fuse instead of 30 amp.

Do you have other 12V stuff on in the trailer?
Is the trailer plugged into the TV or 120V while you are trying the switch?
The reason for these 2 questions is that everything else uses that fuse to.
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Old 01-20-2013, 09:44 AM   #11
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Sounds like one of the brake coils in a wheel is shorted. Or you have a short in the blue wire between where the break away switch is connected and where it connects to the rest of the brake wiring.
Do not eliminate the fuse. It is there for just this reason.
Do you have any other 12 volt DC devices running while you are testing the break away switch?
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Old 01-20-2013, 10:20 AM   #12
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The fuse in the negative side of the battery is there for a reason.

It will blow if the battery is hooked up backwards and the Univolt is turned on, or running.

Andy
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Old 01-20-2013, 11:36 AM   #13
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What is a Univolt? I tried it without the fuse, jacked the trailer up, spun the wheels, and pulled the break away pin. Tires locked up great. Getting 12.0 volts on the multi at each brake. Why is this 30 amp fuse on the negative required?
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Old 01-20-2013, 12:20 PM   #14
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The Univolt is a Converter. When you are plugged in to shore power the Converter charges the battery and provides 12 volt DC power to the trailer. It converts the 120 volt AC power (shore power) to 12 volt DC power. Which is used for the interior lights, furnace, water pump etc.
Since the 12 volt power uses the chassis of the trailer for the return path (common/ground) side of the 12 volt DC circuits. There is a fuse to prevent an over current situation. The fuse only protects those circuits wired thru the Converter.
Since your brakes work with the blown fuse. It is obviously not in the brake circuit.
When you say the fuse is blown. Does it show signs of being melted in the glass window?
Do any of the 12 volt DC devices in the trailer work with the fuse being blown?
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