Just to chime back in on a few things:
I am not very good with electrical. Sure I know the basic "+" to "+" and "-" to "-" and don't put the wrong one one the wrong side. I used to (back in the late 80's and very early 90's) install high end car audio systems. I never was much for figuring out the technical meter stuff. Its all very confusing for my little brain.
I am more than willing to spent $100 on a meter, the $400+ price tags on the Fluke units kinda shocked me though. It would be a waist for me to buy one. The cheap HF one is out too. My father had one of them. The key word is HAD. Not that I don't buy from HF on occasion, just not for this application.
Larry, would you please go into more detail with your statement? I do not understand. Mine is an '05 745Li.
I am not comfortable taking my $95,000 car to Autodrone to have them do any kind of test on it. TOO many electronics on this car with too much of a chance to make one little mistake that will cost me thousands of dollars. Heck, the alt its self is nearly $1000 as it stands.
I hope it isn't the alt, as they are tied into the water jacket on the 4.4s and a real PITA to get to. I don't have a lift, and getting them from the underside is the only way. I usually just projects like this as an excuse to buy tools. GOOD tools! However, I simply can't justify spending big money on a meter.