Wiring diagram 1 40 amp under dash pod.
wiring diagram 2Hope this helps.
Make sure you turn coach (aux) switch on/off without engine running for testing. You could be hearing the charge relay and not battery disconnect. 1/0 red wire goes to charge/emergency start relay then to battery disconnect.
Locate model of battery control center and post.
You could use larger fuse for your temporary connection maybe as large as 30.