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Pyrofuses disable the ignition when the airbags have been deployed, a crash sensor or other major fault has been triggered, so I assume this is an accident car.
I can't check as we don't have our SL anymore but the pyrofuse should be directly connected to the positive pole to the battery (similar to this pic - red body).
Again. not a tech here but we have some great people like Konigstiger on the forum here who have the knowledge and documentation. I read that it maybe also integrated in the prefuse-box...
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
