How can I test if I need an alternator or just change the voltage regulator?

Thanks,

Fab

DVOM set to ac...check for ripple. No more than 0.50vac.
Check charge levels..1500 rpm = No more that 14.6vdc.

If in doubt buy a new reg'.


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http://dieselgiant.com/mercedesvoltageregulatorinstall.htm

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Volt meter set to DC, connect to battery posts, start car, with all accessories shut off (incl climate control set to "0"), should read 13.8 to 14.2 volts.
Gilly

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