benzborg -

The stock Bosch 70A alternator that would have come with a 1988 300E isn't strong enough really to power that car. Which is why MB quickly went to the new 80A alternator (in 1990 I think). Not only does it make more power overall, the key is that the 80A version makes considerably more power at idle speed. The 70A needs higher (i.e. driving) speeds to make anywhere near its rated load.

So...if the '88 300E is a keeper, you may want to simply upgrade the alternator while you are at it. You might be able to fix the 70A, but it will probably cause headaches for you down the road. If you are going to get in there and spend time and effort on it, I would strongly advise getting the 80A.

I made a detailed post about it, including removal instructions, see below. Also note MB DOC's statement re: under-powered alternator.

http://www.peachparts.com/shopforum/showthread.php?p=534174

Good luck!

__________________
Chris
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