Upgrading alternators

[hs_300e]

Will I be able to replace a 1986 300E's 70 amp alternator with a 1992 400E's 110amp alternator without any major modifications?

I amthinking about replacing my viscous fan clutch with a Flex-a-lite electric fan and want the additional alternator capacity to run the electric fan.

Thanks.

[mbdoc]

Changing from the 70A(Al65X to the 80A(AL66X) is the most common & easiest change.

[hs_300e]

My alternator gave up and I need one to fix my car over the weekend. My local parts store has one in stock.

But I want to upgrade to an 80 amp alternator.

So, are there any distinguishing features between a 70 and 80 amp alternator. That way I can verify that I am buying the higher capacity one.

Thanks

HS

[hs_300e]

Thanks to the posts in the following two threads, I was able to upgrade my alternator to a 143 amp unit from a 1997 S420. If one of you is ever going to swap out your 70Amp alternator, I would strongly suggest reading through these threads as there is a great deal of very good info:

Alternator Options - I need Help!!

http://www.peachparts.com/shopforum/car-audio-multimedia/53236-installed-143a-alternator-my-w124-86-95e-class-photos-post444946.html

I bought my used 143 Amp unit from Ptomac - http://mbpartsonline.com/