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Old 09-16-2022, 10:18 AM   #1
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Identify mystery wire on Atwood furnace

I'm reassembling the Atwood furnace on my 1991 Holiday Rambler Aluma-Lite Free Spirit bumper-pull camper. Prior owner had partially disassembled the components but didn't finish the work. So I swapped out the high limit thermistor, sail switch, circuit breaker, burner/flame tube/grate, igniter assembly, exhaust pipe and blower motor. Upon reassembling everything, I have found a mystery wire that does not seem to have an obvious connection point. See the pics. https://photos.app.goo.gl/z6GXb9QWpMasc1JY6 The charred black wire (I'm replacing it due to the charring on insulation) goes to one of the two igniter connection points. The red wire with a male connection is bundled to that black igniter wore, but there does not seem to be a female connection point anywhere on the exhaust blower wheel side of the furnace or on the gas valve. The yellow wire with a male spade connector also does not seem to have a female connector to mate with. https://photos.app.goo.gl/ACSuyzWQvj6UhWiZ6 The yellow wire is fastened to the body of the gas valve and it is a short wire, so it must connect somewhere on the exhaust blower side of the furnace, close to the gas valve.
Can anybody help me figure out where these two mystery wires should be connected?
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Old 09-16-2022, 11:14 AM   #2
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Model of Atwood Furnace?

Wiring diagram is on cover panel in 1st pic


Yellow wire on gas valve......Ground
*Red wire goes to circuit board connector

Black wire with Red Ignitor wire......could be ground wire for gas valve Yellow
*follow black wire back...where does it come from (ground terminal block)?



MODEL???
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Old 09-17-2022, 06:03 PM   #3
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Atwood 8531-11

Quote:
Originally Posted by Old-Biscuit View Post
Model of Atwood Furnace?

Wiring diagram is on cover panel in 1st pic


Yellow wire on gas valve......Ground
*Red wire goes to circuit board connector

Black wire with Red Ignitor wire......could be ground wire for gas valve Yellow
*follow black wire back...where does it come from (ground terminal block)?



MODEL???
It's the Atwood 8531-11. Probably about 30 years old.
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Old 09-17-2022, 06:10 PM   #4
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Yellow Wire on gas valve is ground ....show be ground terminal on gas valve assembly

Black wire is Remote Sensing for Flame Proving...connects to ground rod on spark electrode assembly
*other end should go back to connector on circuit board
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