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Vinman02

Calgary, Alberta

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Joined: 07/14/2007

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Posted: 09/09/11 06:31pm

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I am cleaning up a wiring mess on a Suburban SF-30 furnace and according to the wiring schematic, I need to connect one of the t-stat wires to 12v at the furnace. My problem is now I have accidently mixed up the thermostat wires where they come out of the wall and connect to the furnace.
I have tried to ring them out with a multi-meter but there is no direct connection to the thermostat. I assume becaused the AC unit is also connected to the stat.
I have a total of 4 wires coming out of the wall, Red/12v, White/ground and 1 orange and 1 black both of which are for the t-stat.
Any ideas on how to figure out which wire I put power to?

Vince

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garym114

Bluff Dale, Texas

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Posted: 09/09/11 07:07pm

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The white wire at the thermostat is normally the wire that goes to the heater for on/off control.

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