After disconnecting the coach and chassis batterys from the system I found solar panel voltage on the coach battery supply line to the 12 volt distribution panel. I also found that a relay was clicking in the panel and the voltage from the solar panel would fluctuate betwen 19 and 6 volts with the relay sound. It turns out the solar panel feeds into the CO detector circuit F8, not to F7 as shown on the diagram and that the detector was intermittantly powered on and off and beeped. The solar panel wire is red as indicated on the electrical diagram. Another puzzle is that when the coach batterys are reconnected and the solar power is disconnected, the CO detector is still powered even with no wire to terminal F8 on the panel as shown on the diagram. It appears a bit of rewiring may be in order. Still looking for what, if anything, is powered by the yellow wire originally attached to F7.
Terry & Julie
1999 National RV Tradewinds 7370