This is a quote from a previous post on how I dealt with increasing alternator voltage. Ignore the alternator "swap" as obviously it doesn't apply, but the voltage regulator part might interest you. FWIW.
"I use the AL69X on my 300SD with a Transpo IB373A 14.4 volt adjustable regulator and am very happy with the increased amperage available for the electrical accessories I've added.
http://www.transpo.de/catalog/US_cat.html
Go to
regulator>bosch>IB373A and you'll see what I found to be a fairly easy solution.
On the AL69X swap, I believe there was a slight belt issue, that was easily dealt with (1035 vs. 1000 belts comes to mind)."
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