Maybe my trials and tribulations with a similar problem as chronicled here: http://www.peachparts.com/shopforum/showthread.php?t=268655 will help you. Installing a volt meter in my car really helps me keep track of when power is being drawn and what the alternator is doing.

Here's what fixed my problem, and I don't think you can beat the price. http://www.**********.com/search/product.aspx?sid=hs5s44bd2mrn1n2cn4girt3v&partnumber=0250201953

That's part number 0250201953 at auto haus AZ

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend