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Old 07-22-2019, 08:10 AM   #1
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red light in rear window of trailer

It lights up when the umbilical cord is plugged in.

I don't understand its purpose.
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Old 07-22-2019, 08:48 AM   #2
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Safety, if visible from outside rear, higher that taillights.?
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Old 07-22-2019, 10:11 AM   #3
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Pictures?

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Old 07-22-2019, 01:55 PM   #4
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no pics, it's raining

The red light is inside the trailer

At the bottom of the back window frame

It stays on as long as the trailer is plugged into the tow vehicle


Is it ungood to leave your trailer "wired up" to your trailer?
Could it be an idiot light, to warn you to unplug?

It's a 1973 trailer. Could it predate fancy brake controllers, and be a confidence light to let you know your trailer is wired up, and be visible in the rear view mirror, while you are driving?
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Old 07-22-2019, 01:57 PM   #5
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It's a preowned trailer....

I mean like....I am hoping that it's not a brothel light.
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Old 07-22-2019, 01:57 PM   #6
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Because

Eww
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Old 07-22-2019, 03:35 PM   #7
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Originally Posted by mandolindave View Post
I mean like....I am hoping that it's not a brothel light.
For some reason, I'm thinking about The Police right now.


Rooooooxanne...you don't have to put on the red light...
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Old 07-28-2019, 05:03 PM   #8
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sorry...bumping this

got no answer
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Old 07-28-2019, 05:09 PM   #9
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Does it light up ONLY when plugged in to umbilical? A photo would be worth a thousand words here.
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Old 07-28-2019, 05:14 PM   #10
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My guess an idiot light someone added, not original. Lots of tow vehicles back in those days did not have protection to prevent the tow vehicle battery from getting drained.

My first Airstream trailer was a 73. It did not "advertise " with a red light in the evening.

ps:
If it glows with the tow vehicle's switch turned off, you've got a problem that needs fixin'.
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Old 07-28-2019, 05:51 PM   #11
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Could it be an idiot light, to warn you to unplug?
I was thinking a light to warn you if you lost your connection, but wouldn't it make more sense to put it in the front window where you'd see it?
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Old 07-28-2019, 06:08 PM   #12
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Thinking about it further; the charge wire inside the umbilical is hot/positive all the time, fed from the house battery, regardless of being connected to the tow vehicle or not. So, how could an idiot light be wire to work only when the tow vehicle is connected.

Show us a photo!

add edit:
Another thought, it might be an idiot light to remind someone that the storage switch is in the on position. That could make the light work only when plugged in to the tow vehicle at the same time the storage switch was off.

ps:
Is the converter near the rear, in the storage area near the rear window? That location might be why the light was located in the rear window instead of the front.
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Old 07-28-2019, 06:08 PM   #13
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I mean like....I am hoping that it's not a brothel light.
........sounds like it is...
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Old 07-28-2019, 06:22 PM   #14
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Year and model?
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