My car uses a Bosch 0-123-510-040 115Amp alternator, and the regulator being used now is a 14.1V unit, Bosch part number 1-197-311-242. Since 14.1V is not nearly enough to fully charge the battery (14.4~14.5V is more like it), it is my intention to raise the output voltage of the alternator to 14.5V with the installation of a WAI IB387-1 voltage regulator, or equivalent. Will 0.3~0.4 volts more make a difference? You bet! and will cure a chronic undercharged battery condition.

I have not been able to locate a dealer that sells this regulator in single quantities or even over the internet. Anyone have any tips of where to order it? It doesn't have to be that exact same model, which I located on a WAI distributor website some time ago and is supposed to be the correct one for my application. Any other brand of regulator would also be fine, as long as it properly fits my alternator, and has a set output voltage between 14.4 and 14.5V.

BTW. already tried the diode trick mentioned elsewhere, but it didn't work. Besides its not the best solution anyway, in my opinion.

Thanks.
-Alex

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W163 ML230 EURO SPEC 1999
W124 300E 1986