Why would you pay a shop to do a quick test and replacement of an alternator? Lack of skills/time? The tools required will pay for themselves in one effort. Time required on you 3.0 application 2 hrs including replacing the drive belts as they are more than likely toast as well.

DIY costs: Alt $200, belts $40

Shop: $300/400 parts, Labor 2.5 hrs @ $125 per hr = $325 Totals $625 min.

Note: Pricing is based on real life not corner gas station skill sets

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green