Yeah, I'd say something isn't shutting down. It usually takes a while with an amp clamp to track down the culprit, but you can always start by checking the usual suspects. First see if the fan stays on when the key is off, as the FSR does that kinda thing when it goes out and is one of the biggest draws you could see. Otherwise you could try pulling fuses of suspect systems while reading the amperage. If you don't have access to a way to read amperage down to the miliamp range (without putting a meter in line as it will blow the fuse in a meter, which is why inductive amp clamps are the way to go) you may need to pay the dealer (or a shop with such experience on BMWs) a couple hours to diagnose it/track it down.

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2003 4.6is