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Old 09-28-2013, 05:20 PM   #1
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Suburban SF-25 bench test setup question

There are four wire going to the furnace.
Red is 12v+
White is grnd
Blue and blue are labeled "thermostat" in the wiring diagram

I have red and white connected to a spare 12v battery (w/inline 15amp fuse) but I don't know what to do with the two blue. Do I connect them to create a circuit? That doesn't seem right because there's 12v going to the thermostat. Any quick suggestions on how I mimic a closed thermostat on those wires?
Thanks,
Milt
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Old 09-28-2013, 06:16 PM   #2
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Red is 12V+.
Yellow/white is 12V-.
One blue is 12V+ when red has 12V+. The other blue has nothing, but needs 12v+ to it also to start things going. So you should just have to touch the blue together.
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Old 09-28-2013, 07:26 PM   #3
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Quote:
Originally Posted by jesilvas View Post
Red is 12V+.
Yellow/white is 12V-.
One blue is 12V+ when red has 12V+. The other blue has nothing, but needs 12v+ to it also to start things going. So you should just have to touch the blue together.
Thank you!
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