Originally Posted by mbtelguy
No doubt there is some vairation in the wiring from one model
year to another. On my 378 the 2 fuses directly connected to
the batteries are 1 for LP Detector and the other for the step.
LP is a 5amp fuse. Steps is a 25amp and awning is a 15amp. One or more of these fuses could be connected to the side of the battery control center. That is still directly off the battery. You must not have a powered awning if you do not have the 15amp fuse. Steps, awning and I think maybe O2 (5amp fuse) detector still have power available even if battery switch is set storage. I believe there also is a 5amp fuse for the step switch input but it may be in the battery control center, maybe. I don't have all the documentation to back this up and not sure how accurate it is. I'm done.