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Old 01-27-2011, 12:37 PM   #1
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1971 31' Sovereign
Dallas , Texas
Join Date: Oct 2010
Posts: 47
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What the heck is this wire?

I've gutted a 71 sovereign and have found what seems to be 2 fiber optic wires coming in by the 110 box above the water heater opening. They were putting out a red light but I had no power hooked up. Later after cleaning up various shorts I did hook up a battery to test the 12V system and waited until dark to see how well the lights actually did. I noticed the 2 wires no longer had the red glow.
I found a small 1 inch plastic part mounted on the outside above and forward of the H2O heater door that has 2 small red lens facing towards the front of the trailer, shined the flashlight into them and the open ends lighted up again! I'm guessing now that this was conected in front of the pilot light and you could view it from the front of the trailer or even from the TV if it was bright enough. Am I off track, has anyone seen this set up and is it standard equipment?
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Old 01-27-2011, 12:50 PM   #2
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Those fiber optic cables are part of the taillight monitor system in the trailer. The other ends of the cables are supposed to be mounted one in each taillight. You are right in that from the TV you can "monitor" your taillights and turn signals to see if they are still operating. It is not connected to the water heater or the pilot light.
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Old 01-27-2011, 03:32 PM   #3
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1995 25' Excella
waynesboro , Virginia
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I had the same question some time ago, did some research and believe the answer given by wasagachris to be correct.
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Old 01-27-2011, 05:53 PM   #4
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1972 31' Sovereign
Lexington , Minnesota
Join Date: Feb 2009
Posts: 3,817
Yes, WC is correct. Our 72 has them as well. They run from the inside of each tail light housing, in between the inner and outer skins to the little holder on the side of the trailer. One fiber optic for each tail light.

Chris (MC)
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Old 01-27-2011, 09:34 PM   #5
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1974 31' Sovereign
Ottawa , ON
Join Date: May 2008
Posts: 11,219
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Of course, my '74 has them too, and I've always thought that they were the most clever thing that AS ever put on their trailers.

Imagine that: fibre optics, in the early '70s, standard equipment! No wonder we love these wonderful devices...
“Courage is being scared to death, but saddling up anyway.”
...John Wayne...........................
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fiber optic, taillights

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