[NeedaMog]

ACUF, what is the failure mode of the original? if you have an external regulator, you may only need to replace the brushpack with an internally regulated brushpack. This would eliminate the original regulator and the harness between it and the alternator. I replaced my alternator (12V system) with one from an 80's model VW Golf which has the same external dimensions (clocking) as the original. The one I installed is a 90A rather than the original 55A so I upgraded the wire size on the B+ wire to the battery and transferred the original pulley from the old alternator. I have even seen a few of these that had the W terminal for the Tach output.

 

[NeedaMog]

But, probably not the same number of poles as the original. The tach would probably not read accurately.

Good thing I didnt try to use it. Mine has a Tiny Tach.

 

[NeedaMog]

I guess my first post was implying a possible bad regulator. The brushpack should be checked for worn brushes. A common and easily repaired issue with the Bosch alternator. Also, as graphic66 stated, check the warning light operation.

 

[NeedaMog]

...Kinda like the 'knowledge' that setting a battery on concrete will ruin it. That was true decades ago when battery cases were made of hard rubber which became porous, absorbed acid, and conducted, thus shorting itself into concrete. That's no longer a problem. ....

I had this discussion with a co-worker a while back that insisted that this would kill a modern battery.
I found info on several battery manufacturers websites calling it an old wives tale with old basis of fact (older battery construction). It does not apply to modern batteries.