should measure close to zero, not actually zero
if it reads open its the fusable link under the clutch,

It can be fixed without removing the whole compressor, but there is not much room and its not fun.
there is a thread on here about it from someone else

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2004 X5(E53) 3.0L
1999 M3(E36)
2003 Z4(E85) 3.0L