Weirdness: Does this sound like a voltage regulator or the ETA? - Page 3 - Mercedes-Benz Forum
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post #21 of 28 (permalink) Old 07-09-2015, 06:04 AM
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Change your Alternator and you be OK. Make sure you get the right volts one for the car
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post #22 of 28 (permalink) Old 07-09-2015, 09:08 AM
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I really should stick to calling it D+.... yeah, I looked it up again, duh, everywhere I said circuit 64, its 61 :/


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post #23 of 28 (permalink) Old 07-09-2015, 09:40 AM
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[QUOTE=DeluxeOKC;12462961]Final update: Problem solved. As I suspected in my last post, it was indeed the alternator. I bought a Bosch reman (from O'Reilly of all places) for $139, and had it swapped out in under 30 minutes. Voila. All of my idiot lights are back to normal function, and I'm seeing 14.35V at the battery at idle.

this high voltage is scary. I am afraid you get wrong alternator. Just for sure, please check the parts number of voltage regulator ( with mirror it is easy )
For E320sedan 1 197 311 213 (Bosch) is a right one. (MB number: 002 154 8506) For Wagon 1 197 311 242... This is a common mistake of US parts suppliers, they don,t know right about E320 models....
Using another regulator or alternator is not a joke, this could follow several damages in the system. 14,5 V is a highest possible voltage - this is when the Battery fully (over?) charged.
Please check the battery Voltage ignition of. Normal around 12,65. Start engine and check the voltage in idle ( A/C, Light, rear window heater on) Charging in this case around 13,65 V.

Please note: OVP relay will abuse with the high voltage. Your OVP is already done, tired, .
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post #24 of 28 (permalink) Old 07-09-2015, 10:16 AM
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FWIW, sealed lead acid ('maintenance free') aka valve-regulated lead-acid (VRLA) batteries use a slightly higher charge voltage, and newer cars tend to come with these and have alternators setup for this.


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post #25 of 28 (permalink) Old 07-09-2015, 10:56 AM
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Nice to hear you got it sorted out .

FWIW , 14.5 VDC is _not_ high voltage , it's what pretty much any Bosch alternator puts out if you have the correct regulator ~ .

That's why I don't like the " HUCO " etc. off brand regulators / brush holders ~ they all charge too low .

Even the old 55 ampere alternators are fine if you use the correct Bosch branded regulator , otherwise you'll rarely if ever see 14 + VDC as you should for proper charging and operation of lamps , window lifts etc.
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post #26 of 28 (permalink) Old 07-09-2015, 01:07 PM
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according the manual for a 12 V battery: 13,85 V = float charge, 14,45V =boost charge
I got from the parts supplier (wrongly) the end of "242" regulator, installed to my E320 sedan I got high 14,45 charging, tail light, license plate light... frequently burned out, OVP damaged. After information from FD (here) and from the EPC the right one is the end of "213" ---- After I purchased, installed, it....... I have charging voltage 13,85 V . This is a same like on any other W124 which I have ever experienced. ( my other E320 as well..)
Than according a manual, according the charging sense , according the experience the 12 V battery float charge is 13,85.
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post #27 of 28 (permalink) Old 07-16-2015, 10:46 PM Thread Starter
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Just another update, after a week or so of driving with the new alternator -

Thanks (I think!) for the input pbuchmueller66, but I verified that I had the correct 90a alternator for the car, and verified that I had the 213 (made in GB, no less) voltage regulator prior to install. The 14.35 reading was at idle without the a/c or headlights on It shows ~14.20 under full load. Everything is operating as it should, with no blown bulbs, etc.

Funny... There's a phenomenon that occurs on just about every Euro forum I've frequented (Mercedes, BMW, VW, Volvo, etc.). Once the problem's been solved, there's always that one guy who shows up late to rain on the parade!

Anyway, everything's copacetic for the time being. We'll see how things go when we trailer the car to New England for vacation in a couple of weeks!
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post #28 of 28 (permalink) Old 07-16-2015, 11:13 PM
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I am glad because you satisfied with the present condition. Because the alternator and voltage are fit for this model, maybe some other reason generating higher voltage? How about the battery voltage if engine stop? Charging voltage could be close to 15 V if the battery fully charged. This happened with me also, for sure I checked the voltage with low charged battery ( after shut down engine I left on the headlights for about 1 hour)
But battery age and condition could influencing the value of charging voltage also

In case your system will work like this perfect, this will updating my knowledge about charging values.

Last edited by pbuchmueller66; 07-16-2015 at 11:21 PM.
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