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Old 05-03-2020, 10:22 AM   #1
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Thermostat wire

I have a model 391SAB that the wire for the thermostat has been chewed through by a mouse... Where does is the other end of that wire? Any tips/tricks for running the new wire?
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Old 05-03-2020, 12:54 PM   #2
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I have a model 391SAB that the wire for the thermostat has been chewed through by a mouse... Where does is the other end of that wire? Any tips/tricks for running the new wire?
You need to post what brand a 391SAB is.
Also make and model of thermostat.
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Old 05-03-2020, 02:51 PM   #3
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Its a forest river sandpiper destination trailer. And the thermostat is a Dometic
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Old 05-07-2020, 02:22 PM   #4
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The thermostat wire goes between the thermostat and the A/C control box above the grill. If you pull the ceiling grill off you can see a metal box. It goes to there.

As for pulling a new wire, it would be easier if the existing copper is intact. Then you could tie to it and pull the new cable with the old.
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Old 05-07-2020, 02:29 PM   #5
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Originally Posted by Larry_S View Post
I have a model 391SAB that the wire for the thermostat has been chewed through by a mouse... Where does is the other end of that wire? Any tips/tricks for running the new wire?
Why not repair the wire at the damaged area?
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Old 05-12-2020, 11:53 AM   #6
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The thermostat wire goes between the thermostat and the A/C control box above the grill. If you pull the ceiling grill off you can see a metal box. It goes to there.

As for pulling a new wire, it would be easier if the existing copper is intact. Then you could tie to it and pull the new cable with the old.
Splice in a piece of telephone wire. If you have a phone jack on a wall of your house take off cover there is usually 12 to 24 inches of extra wire coiled up in wall. This is standard procedure to have extra wire in wall. Cut off a piece reattach to jack and use wire nuts to splice in wire for your rv.
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Old 05-14-2020, 10:26 AM   #7
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There are three sets of wires coming to the tstat. One set goes to the ac control board as mentioned 2nd set is power/ground, 3rd wire goes to furnace.

Best way to sort out which set is affected is to look at the schematic for your tstat.
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Old 05-14-2020, 10:35 AM   #8
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I would NOT use telephone wire. Multi-strand thermostat wire is available at most home centers by the foot. I believe with that thermostat, as stated, all wires to to the AC, then the furnace controls are run from there to the furnace. If the wire is stapled inside the wall you're not going to pull new wire using it as a pull string. How far is the AC from the thermostat? Pull the cover off the AC and see if you can trace the small control wires.
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Old 05-14-2020, 07:17 PM   #9
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Agree about phone wire. Solid wire in that small of a diameter does not hold up well to vibration.
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