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Old 05-28-2022, 04:44 PM   #1
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So I bought a 2002 jayco designer fifth wheel 36 ft long and the central air is not coming on I pulled the thermostat and it looks like telephone wires going to one large if there's one large wire only and it's white could someone help me on what's supposed to be going to that thermostat thank you
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Old 05-28-2022, 06:31 PM   #2
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A whole bunch of questions here. What brand thermostat? Is there only one A/C running off of that thermostat? I am guessing that the thermostat also runs the heat but you don't say that so it is a guess.



I am thinking that the best bet might be to get the make and model numbers off of the thermostat and see what the wiring diagram is for that unit.



And I am really not understanding your description of what you have as a set up.
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Old 05-28-2022, 06:44 PM   #3
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Originally Posted by Rusty5 View Post
So I bought a 2002 jayco designer fifth wheel 36 ft long and the central air is not coming on I pulled the thermostat and it looks like telephone wires going to one large if there's one large wire only and it's white could someone help me on what's supposed to be going to that thermostat thank you
Larger guage white wire is almost certainly the ground in an RV.

Here is a good reference drawing/thread.
https://www.jaycoowners.com/forums/f5/ac-66774.html
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Old 05-28-2022, 07:07 PM   #4
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Originally Posted by Rusty5 View Post
So I bought a 2002 jayco designer fifth wheel 36 ft long and the central air is not coming on I pulled the thermostat and it looks like telephone wires going to one large if there's one large wire only and it's white could someone help me on what's supposed to be going to that thermostat thank you
Post a picture.
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