Mine run between 13.x and I think 14.1 at the top. That suits me just fine; I don't *want* it higher. Anything over 12.6 is recharging, and the slower you recharge, the better the charge and the battery last. I almost always go at least half an hour any time I start the car before shutting it down again, which leaves plenty of time for it to replenish what it used on the previous engine start. Just pounding extra voltage into the thing beyond what's necessary to trickle-charge constantly is just extra wear on the battery chemistry, among other things.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

A guy on Benz World posted this:
http://www.turbobricks.com/mods.php?content=art0004
Uses an external Motorola Voltage Regulator.

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84 300D, 82 Volvo 244Gl Diesel