Umm I thought that most VOM/DVM's had a capacitor in series with the input... This ensures that only the ac component is measured.
-- John W Reames jwrea...@comcast.net Home: +14106646986 Mobile: +14437915905 On Nov 30, 2010, at 8:57, "Mike Gildea" <mikgi...@verizon.net> wrote: > > >> I'll second that thought. >> >> Would that also manifest itself as a measurable AC waveform on top of the >> expected DC voltage? (I would also expect that it would kill batteries) > > If you had a o`scope, you would be able to see the ac and dc waveforms, but a > multimeter will just average the readings. A small amount of AC (ripple) is > normal and hurts nothing. Larger amounts indicate bad diodes. There are a > lot of large diodes in a altenator. Just one shorted out can cause a battery > drain. > AC is only present when alternator is rotating. When rotating AC is > converted to DC by the diode bank. The voltage regulator then clips the high > voltage down to aroud 14 volts. > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
