Not always - ask your friends who they have used for auto electrical problems. I might have said use the dealer for problems with the base car but these seem to be problems brought on by the use of aftermarket parts. A dealer would have to start from the same place any competent shop will.

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Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E30 318i; E32 735iL; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i