Thus, when ignition is killed, the rug is pulled on the juice and the player will run out of power before it can shut itself down. Hence the thump

I see your point. However, if the ignition sense wire can also pull the primary juice to feed the player without the yellow wire, then my theory (blown fuse on yellow wire with a correctly wired player) could also explain it.

Hugo, if the player is only getting juice through the ignition wire (i.e., if the yellow wire isn't getting any juice), then will it still run? And if so, can the software also tell the difference? In other words, if they have only the ignition wire hooked up but not the permanent wire, or if they have them backwards, then perhaps the player could display a (defeatable) warning message?

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Tony Fabris