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Old 03-17-2010, 07:42 PM
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AJD AJD is offline
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Join Date: May 2006
Location: New Hampshire
Posts: 49
W123 alternator / voltage regulator question

The 240D is having starting issues and at first glance, the brushes in the voltage regulator appear to be short. But never having pulled them before, "short" is a relative term to me.

From the pictures, I assume these are a first place to start? Do these look like they need replacing?

I should mention the symptoms: battery is draining (obviously not being charged). My daughter was the last one driving it and she said the battery light came on, on the way home. The next day, dead battery.

I thought it may be the alternator, but figured I would pull the voltage regulator first, based on searching the archives.

Also, I have a W123, 300D ('83 or '85, I forget) parts car. It has the double pulley style alternator. Anyone know if this would fit the '81 240D (just forego the outside pulley)?

And is there a way to "bench test" the voltage regulator with a multi-meter?

Thanks,
Andy
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