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Old 02-23-2012, 02:28 PM   #1
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1967 22' Safari
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Wiring new Suburban furnace too many wires??

can anyone tell me why their aresix wires in the furnace location. two pairs are aluminium and one pair is copper. Which ones do i use. Old furnace was not connected so i have no idea and do not have wiring diagram for my new 67 safari internation.....
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Old 02-23-2012, 02:44 PM   #2
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I installed a new Suburban NP30 2.5 years ago in my 65. My wiring is as follows:
Red to large Orange, Yellow to large White ( these are the 12v and ground), the 2 blues go to the smaller white & black (these should be the thermostat). Not sure if this is perfect but mine works.
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Old 02-23-2012, 02:55 PM   #3
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Mine only has 4 wires.

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Old 02-23-2012, 03:16 PM   #4
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six wires coming from trailer, not furnace

i have six wires coming from trailer furnace wall location, can any tell me which four to use. 2 are copper and 4 are aluminium. There are three holes in the wall for each pair, if i could only find out which are which from this location.....
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Old 02-23-2012, 04:23 PM   #5
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Do you have a picture of the wires in question? Also, do you own a multimeter or have a 12 volt test light? Just a guess, but if the copper wires are larger gauge than the aluminum ones, the copper wires are probably 12 VDC and ground/return. The aluminum ones might be the thermostat. But that's a wild guess without seeing them or doing some testing.

Chris
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Old 02-23-2012, 07:53 PM   #6
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My trailer had one hot/ground pair used for the range, one hot/ground pair for the heater, and one pair for the thermostat. A jumper light, and one multi-meter is all that's needed to identify what's what.
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Old 02-23-2012, 09:44 PM   #7
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thanks for the replies guys. learning so many things at once is a challenge and a lot of fun. Chris, I will post pic in the morning and hopefully you could let me know what you think. I think the thermo wires are not an issue, its the other four that concern me.

thanks again....
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