Moderator: Recommend thread be moved to the A-frame forum.
On your converter are 6 DC (12V circuits). Normally the Propane/CO detector is connected to the General circuit that includes CO detector, water heater, furnace, porch light, and tongue light. On my 2014 A122, this was the 4th fuse down, 15A, with a blue wire out the back of the converter panel. You will likely find the blue wire going into a large wire nut with a bunch of other wires.
The red wire going to the CO detector has probably been clipped at the wire nut. If there is enough remaining of the red wire, you join the + on the new detector to that red wire. Otherwise, undo the wire nut and add the + from the detector (probably red) to wires in the wire nut. Or get a small bus bar from Lowes or HD and remount all those wires to the bus bar (what I did when I had to replace the converter).
The black or (-) wire from the detector ties to all the white wires (grounds) in a big wire nut. Again, chances are prev owner just clipped the black wire short of the wire nut. Again, you can add the new detector (-) (likely black wire) to the wire nut, join to the stub if long enough, or add a 12V (-) bus bar.
At the top of A-frame specific forum, there are a couple of stickies that talk about wiring in the A-frames.
Hope this helps
Fred W
now 2019 Flagstaff T21TBHW A-frame (same as A213HW)
then 2014 Rockwood A122 A-frame
2022 Hyundai Palisade
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