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Old 03-21-2014, 07:27 PM   #1
Ford Super Duty Owner
Join Date: Feb 2013
Posts: 30
Missing wire on CO detector ????

I replaced a wall mount with a flush mount CO detector on my Coachman 2004 Class C. I have 2 wires that go to the hot side of the unit but found only 1 for the ground side. I also installed a new LP unit. That had 2 for the hot & 2 for the ground. Did 1 of the wires fall down inside the wall ? I looked for a diagram but no dice. The CO unit was not working prior to this replacement. I checked the fuses but everything seems to be ok. The wall is against the shower. No room except for a coat hanger, so tomorrow I' ll go fishing. thank you. Dave

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Old 03-22-2014, 06:45 AM   #2
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Posts: 2,043
Most detectors have 2 hot leads so that they can be powered from 2 different 12v sources in the RV. Typically 1 hot will run to the house battery side, and the other to the chassis battery side. The intent is to make sure the unit is still powered in case you disconnect one or the other (house or chassis batteries). I have seen several that use a common ground (only 1 ground wire) that will work for either + source. To verify just use your volt meter or test light to either hot to that single ground - you should see 12v from either, provided of course your disconnects are not turned off.

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Spartan/Cummins 8.3C-300HP/Allison 3060 WTEC-II/25yr RV Tech RVIA Certified/Onan-Cummins Certified
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Old 03-22-2014, 06:01 PM   #3
Ford Super Duty Owner
Join Date: Feb 2013
Posts: 30
dead ground

Thank you for your response. My neighbor used his meters, he found that the ground wire is disconnected somewhere. We hooked a wire to a ground in the ceiling light & the 2 orange hot wires and the co detector worked. We are going to see where we can bring in a new ground without ruining her m/h, I only drive it & pay the bills. Thanks again. Dave
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