You can mount the 90 amp into the diesel Vanagon and I have done so
several times. It fits the mounting bracket fine but the belt tensioning
arm of the DV alternator is too short. A different arm must be made. The
belt needs to be slightly longer as well. The DV came with a 2 belt
system and with the 90 amp I simply use 2 identical belts of the size
for the water pump, 643mm long. The wiring MUST be upgraded from the
alternator to the battery with a larger wire for the extra current.

The Bosch 65 amp pulley can be moved to the 90 amp Bosch alternator but
the Motorola is a unique beast and nothing from it fits on Bosch. The
Bosch pulley setup you would need is common as dirt since it was used on
most 80s VW cars. The complete 90 amp alternator from most of these is
the same as what you want anyway.

If you have now or plan to add a diesel tachometer you will need an
alternator with a "W" lead on the back. Any alternator can accommodate
this but you should be sure it is already there if that is what you want
to end up with.

Both the Bosch and Motorola 65 amp are seen on DVs but the Motorola can
be a pain in the long run. If you need to replace it some stores will
reject it as a core trade-in for the more common Bosch.

Mark

Edward Duntz wrote:
> Hello,
> basically three alternator choices listed on BD web site for the diesel Vanagon- a 90 amp and a 65 amp Bosch, and a 65  amp Motorola. Are these interchangeable? If not, what are the differences? Mounts? Pulleys?
>
> The reason I'm asking is that I'm still considering buying a diesel Vanagon from my mechanic. It's not quite ready yet, but I believe it has the Motorola alternator, and I want a 90 amp alt. to go in there. What would I have to have done?
>
> Thanks,
> Ed
>
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