Pagoda SL Group
W113 Pagoda SL Group => Electrical and Instruments => Topic started by: awolff280sl on January 29, 2008, 19:56:47
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Does anyone know if either the Bosch alternator designated AL72X or AL74X is the bolt on 55 AMP "upgrade" for our 35 AMP alternators (designated AL64X). I thought the AL72X was the one, but when I put my original (iron) pulley on it, the alternator fan scrapes the housing. The attached image shows the AL72X on the left, and the alternator presently on my 280sl. Should I look for a different alternator or a different pulley?
Download Attachment: (http://images/icon_paperclip.gif) alternators2.JPG (http://www.sl113.org/forums/uploaded/AWOLFF280SL/2008129205326_alternators2.JPG)
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I replaced my AL64X with a AL74X and reused the pully fan. I did need a new plug to make the elctrical connections.
Jeff C.
1970 280SL 4-speed
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I did the same, and as these were used on sedans of the era (early 70s), I found the alternator together with the plastic/bakelite connector at a dismantler. (I suppose you could also get the connector new from the dealer or other supplier-- e.g. look for the corresponding early 70's 280se 108 part).
Waqas in Austin, Texas
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In the photo it looks like you have the cast aluminum fan.
You may have to change it over to the later style stamped steel fan. I believe these were made for the 55anmp alternator.
Al Lieffring
66 230SL
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It seems Al's suggestion to use the updated pulley makes it work.
Since some members have reported no problem with their original pulleys on the 55amp, I wonder if there is more than one alternator pulley type, perhaps due to aftermarket A/C.
Thank you!