I want to swap the AL129X alternator I put in my 1981 300SD to the 'new' 1986 SDL I just bought. The question I have for you OM603 gurus out there is this. Has anybody put the Bosch AL129X 115 amp alternator on a 300SDL?

I know that the pulley and mount have to be swapped, but I need to know if the new alternator will fit in the OM603 mount and work with the serpentine belt setup.

Also I am assuming that the 70amp AL65X in the SDL will fit in the mount for the OM617 on the SD. Am I right in thinking this?


Thanks!!

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Can't be done. The shafts and pulleys are totally different between the two. The AL129x alternator will ONLY work for V-belt engines like the 617 and 117. The good news is that you can easily swap a late MB/OEM 110-150A alternator on to your 603 for cheap. I've done this on several of my 60x engines (and my M119). Details are here:

Installed a 143A alternator in my W124 (86-95 E-class) - with photos

Skip to page 2, post #21, for details on why the AL129x will not work (and why you can't put the late alternator on an old V-belt engine).

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Thank you for the info...

__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad