By the way you can get one at Fastlane here for about $15 German no name brand. (i bought one) or a Bosch for about $45. You be the judge. I have a spare car if mine goes down.
If the cheapo reg don't work you may have a problem in the alternator.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T