If you know where the noise is coming from, why not stop it (or reduce it) at the source, if you can? Isolate/by-pass/filter the 'XM' thingy's power lines. Moving that power source from the vehicles wiring by moving it to the battery isn't really removing it from the vehicle's wiring, just changing where the power happens to be tapped from that wiring. If that 'XM' thingy is putting noise into the wiring now, it certainly can do the same thing from the battery too. Making that move might make disconnecting any 'standby' power easier, but it isn't really 'fixing' anything. Not being familiar with any of the 'XM' stuff, will it loose it's programing by doing that? (I don't know, that's why I'm asking.)
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