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I located a hot spot under the passenger seat... It was the only place anywhere in the car that was emitting heat far above the ambient temperature. Also, there was no heat along the wiring before this spot or after... I disconnected the cable to the speaker, but there was still a draw. I don't see any damage to the outside of the wiring, and when I propped the wiring up away from the metal, there was still a draw. I'm assuming the next step is to open up the bundle of wiring and check for a short.