Originally Posted by Raider Battalion
I would also call it clunking. But it is coming from all over the coach not localized from one spot. It could also clunk simultaneously from several locations. Also, I haven’t seen any issues with the battery voltage.
You won't see any issues with the chassis battery unless you go to start the engine and it doesn't. Or the little blue lights on the driver's area USB jacks are off because the chassis battery is dead.
The contactor is located in the first compartment aft of the door on the passenger side, where the house batteries and the leveling jacks and fluid reservoir are located. The back wall of that compartment, the one facing the center of the motorhome, is open for venting purposes so the sound does travel.
If you're plugged into shore power, you could disconnect the house batteries by pressing the bottom of the spring-loaded switch next to the passenger seat. If the house batteries are disconnected then the chassis battery will not charge. If you still hear the noise it's not what I think it is. (Neither the house batteries or the chassis battery will charge on shore power if you have the batteries disconnected with that spring-loaded switch.)
Yes, if you're on shore power and you disconnect the house batteries that little yellow light on the spring-loaded switch stays lit. The light is useless.
Or open that compartment door and see if the noise is a lot louder when you're outside.