I have learned much in the last 30 minutes or so...I checked out Transpo's online catalogue. It's incredibly efficient and complete, especially with the references.
The regulator/brush assembly I received from my mechanic was in fact not a Bosch but a Monark regulator - part number 082966090. It puts out a set voltage of 14.2V. The equivalent Transpo regulator is the IB350.
The correct voltage seems to be a subject of quite a bit of debate. Browsing the Transpo online catalogue returns two possible regulators for my car - 1989 300E - a 14.1V and a 14.5V. It also states that I have an 80 A alternator. Is this correct?
My battery is an Interstate MTP-91 with 700 CCA and 875 CA.
So...after all of this, I should be fine with the Monark set at 14.2V...
Thanks again for the helpful advice...I continue to learn.
Transpo Online Catalog
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon