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Old 10-01-2014, 06:50 PM   #15
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1975 25' Tradewind
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Picture of wired light.



it is not the truck. Had a friend meet me here in an f150. No running lights.

https://www.dropbox.com/sc/rgmmksl9u...aseNrH0cQrzY1a
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Old 10-01-2014, 08:44 PM   #16
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Originally Posted by tallredboned View Post
where is this?
Get a 12v test light.
Bare the wire from the trailer that goes to any of the marker lights (careful not to touch the trailer)
Connect 1 test light wire to the trailer wire you just bared, other to ground
Hook up the TV, parking lights on

If the test light doesn't light up you have an open between the trailer pig tail plug and the marker lights. I would check the plug's condition, see if there are any breaks on the plug to pig tail wires

If the test light does light up, you have power but the lights aren't installed correctly. Either the power or the ground isn't connected properly

If the test light doesn't work and the pig tail plug looks good then you have a problem unless you can trace the 12v marker light wire from the trailer pig tail to the trailer marker light connection / junction. I don't know where this is but since all of the lights are out it would seem that this is your problem.
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Old 10-02-2014, 12:47 PM   #17
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Soooooooo....today. I blew a 30 amp fuse. I disconnected the 15 amp circuit breaker on the white box inside the trailer.
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Old 10-02-2014, 12:51 PM   #18
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Then I checked the lines inside the trailer and got no power to ANY of the circuits.

Reconnected the wire and blew it again.

I am now replacing the umbilical...one of the lights should have worked ... but with out the breaker the line blew. So it has to be the umbilical cord.
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Old 10-02-2014, 03:47 PM   #19
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Originally Posted by tallredboned View Post
Then I checked the lines inside the trailer and got no power to ANY of the circuits.

Reconnected the wire and blew it again.

I am now replacing the umbilical...one of the lights should have worked ... but with out the breaker the line blew. So it has to be the umbilical cord.
You have to realize there are NO fuses in the trailer that have anything to do with the taillights.

Likewise you have to till us what 30 amp fuse you blew and what you were doing when that happened. Again there is No 30 amp fuse or breaker that would be connected to the taillights.

Did you do the tests I noted above?

Troubleshoot electricity is a very exact science and requires detailed input. Comments that are completely out of the realm of possibility through us for a loop.
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Old 10-02-2014, 09:13 PM   #20
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1975 25' Tradewind
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Found it...

There is a breaker box behind the 7 pin on the trailer. Replaced the breaker with a larger breaker and added some power. After I replaced the umbilical cord.

Top front light burnt up. Found the short.
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Old 10-02-2014, 09:20 PM   #21
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There are No fuses or breakers in the trailer that have anything to do with the tail lights. The fuse for the tail lights is in the truck

Replacing a breaker with a larger one you run the risk of MELTING a wire in the wall and then you have a real problem.


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Old 10-02-2014, 11:28 PM   #22
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1975 25' Tradewind
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Here is the pic from the service manual. There are circuit breakers in the back of the 7 pin box.

The problem I was having was the breaker was popping too quick since it was on a 15 amper.

When I upped it...it popped slower but showed me where the shorts were.

Not by burning the line...but by popping the lights. Apparently both screws are necessary in those lights for a good ground.

Anyway problem solved.
Thanks for all the help.

You all are spectacular.
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