Excellent thread. My switch is located behind the circuit breaker panel on my 24sa. I've been told by a service tech. That some people replace them with a manual battery disconnect switch. Contact switch's do go bad.
Thor puts the battery charge relay under the drivers seat. When I got my MH dealer told me MB doesn't allow the engine to charge the coach battery. This is not correct the relay under the drivers seat was bad, had to figure that out myself. FYI if you change to lithium batteries you need to change this to a Li-BIM.
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