Ok fella thanks...so my way of using amp clamp was not totally flawed? Anyhow seeing where the 250a and over is not too healthy...IF the way i measured my draw was ok...and i got say 300amps peak 300a x battery voltage should give a power figure that should not be higher than rating of starter ...correct?so 300 x12v or 300x 10v still gives a pull that i cant see how a 2kw rated starter can handle

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N