Best W123 Voltage Regulator?? - PeachParts Mercedes-Benz Forum

gottarollwithit · #1 03-09-2021, 03:15 AM

Well, my voltage is fluctuating from high 13.6-15.8v at idle. (Lights on, HVAC off) Headlights at idle are now almost flashing bright/dim because of the voltage fluctuation. Pretty sure this is caused by poor V reg quality. Yes, I’ve got an additional ground cable on my alt to the chassis

I put in one of those Eagle Auto Ebay high power alternators in 3/17. That reg died in 11/19 where I replaced with a Hella.

Who makes the absolute best, longest lasting V reg for this car??

I’m between Bosch or a German company called KAE. Any input???

Any idea where to find a Monark long brush voltage reg??

barry12345 · #2 03-09-2021, 09:28 AM

Bosh regulator should still be decent. Make sure to check you electrolte level in the battery. You probably have been overcharging.

gottarollwithit · #3 03-09-2021, 05:09 PM

Any truth in sourcing a Monark with longer brushes?

The 2 regs that have failed did not die of worn out brushes. Something on the solid state part of them crapped out.

Screwdriva · #4 03-13-2021, 03:33 PM

The OE Bosch units are made in Hungary. Monark makes them in Germany, so I'd go with them.

https://www.ebay.co.uk/itm/Monark-Regulator-For-Mercedes-W-123-With-Bosch-Alternator-Generator-Regulator/323015984311?hash=item4b3540c4b7:g:QaIAAOSwal5YMFlw

gottarollwithit · #5 03-16-2021, 03:49 AM

Dang, how’d ya find that!!

Is that 082 868 022??

Screwdriva · #6 03-16-2021, 05:53 AM

I got skillz

I believe it will fit but I would still contact the seller. I don't usually suggest aftermarket parts over OE dealer supplied, except when they're made in Germany. Few companies fall into this category. Monark and Bilstein (not Febi Bilstein) are great examples.

Marshall Welch · #7 03-18-2021, 12:56 AM

The photo in the ebay listing shows a number 082 966 022 on the voltage regulator unit. The listing also states that they don't ship to the US. Maybe try contacting the seller to see if there's a way for you to get one.

Diseasel300 · #8 03-18-2021, 10:44 AM

Quote:

Originally Posted by gottarollwithit

Any truth in sourcing a Monark with longer brushes?

The 2 regs that have failed did not die of worn out brushes. Something on the solid state part of them crapped out.

The factory size brush is good for 100K miles or better. Longer brushes do not necessarily mean a longer lifespan.

If you're popping the electronics in the regulator, inspect your slip rings. If they're greasy or if they're grooved, they need replacing. They do wear out and when they do, it's regulator roulette until you replace the slip rings or replace the alternator.