This is why the underhood tester is useless ~ you cannot see what's going on as you drive .
In either case , I'd replace the voltage regulator using _only_ the BOSCH # 1 197 311 023 one ~ NO OTHER BRANDS , yes it's a bit of a go but easier than removing the alternator in most cases , with some help you can back the right side wheels up onto the curb so the front bumper hangs into the drop part by the driveway , then it's easy to scrootch underneath & reach the alternator (until the DA neighbor begins flushing dirty leaves etc. down the gutter) , you'll prolly need a simple 90° angled screw driver to reach the retaining screws , no need to buy fancy-schmancy $75.00 ones , just go to any Dollar Store , they always have them in pairs , Phillips & flat bladed , I have several different lengths & sizes so I never strip the screw heads .
This job is simple if fiddly and will make you appreciate those of us who endevour to keep the engine as clean as possible as the turbo oil return line is right near the alternator and often seeps or dribbles ,
I contend the oil mist in this area causes short alternator brush life
First things first : go buy the in dash tester and _drive_ the car for 20 minutes or more , if it's then charging over 14.7 VDC , you've nailed it ~ the regulator or diode - triode is bad .
-Nate
Alan wrote:
>
>
> >
> second response: actually it seemed like sulfuric acid smell. If
> anything the problem wasn't undercharging, but overcharging. I had
> checked the brushes before installing the alternator but the original
> battery boiled out it's water before we caught it. It was refilled, but
> obviously wasn't ever the same since which led to its recent
> replacement. We were running a 300D, a 300SD and another 300D until my
> daughter wrecked it. All of the cars had been on and off the road for
> fairly lengthy periods and batteries were swapped back and forth as
> required so we don't have an accurate idea of their history. We now
> have new batteries in the running cars, but are concerned about the
> possible overcharging on the 300D.
>
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