Relay 201 821 00 47 for the Mercedes-Benz R129 Series

201 821 00 47

  • We sell the part whose number is 201 821 00 47, used, for $40.
  • We charge $13 for shipping this part to anywhere in the US.
  • Nevada residents, please add 30 cents which is 7.6% sales tax.

Our parts are used but original Mercedes-Benz quality, guaranteed to fit and work, otherwise (your choice):

  • We replace it at no charge or
  • We refund your money and the shipping costs to you and back to us.

Below is a little write-up that we hope you will enjoy — one more reason to be enthused about keeping your Mercedes-Benz on the road. You could buy the parts from a vendor who doesn’t understand or care about Mercedes-Benz cars, or you could buy from enthusiasts like us. We hope you choose us!


To remove the part, you don’t need any tools (how nice is that?) First, look at the above picture to see how the pins look. Then grasp the module firmly but gently, and slowly wiggle the module back and forth, to “walk” the little pins loose. Then, lift up the module and move it up and away from the general area. To install the replacement, make sure the pins are aligned correctly, and then gently place the module in position and push down until you feel that it is seated.


This should help dispel the myth about Mercedes-Benz vehicles being overly complex. Yes, the internal functionality is complex, and necessarily so, but Mercedes-Benz has made that nicely modularized, and the part is so exceedingly easy to remove and to install that you require no specialized tools or knowledge. That’s about as simple and easy as something like this can be.


In software design, modularization is good. The same is often true for electrical circuit design. Mercedes-Benz seems to be exemplary. Rather than spreading the complexities of the turn signals, hazards, wipers, rear defroster and trailer hook-up across a massively complex wiring harness, Mercedes-Benz consolidated it into one nice module that’s easy to remove and to install. It’s typically in the engine compartment on the driver’s side, close to the firewall, or inside the (nicely protected) fuse box. The functionality and design of this particular module have been so universally applicable that it was used in many models in the R129 series, the 1990 – 2002 SL models, over many years.

This standardization reduces the production costs as well as inventory costs for the factory and repair shops.

This means the money for purchasing and servicing your Mercedes-Benz goes more to aspects that add value and less to inefficiencies.

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Used Original Mercedes-Benz Parts for the R129 Series a.k.a. SL

Buy used Mercedes-Benz R129 original-equipment parts at (in many cases) an even cheaper price than aftermarket parts.  Get the genuine part at a fraction of the cost!  Plus, our used parts are guaranteed.  We trust Mercedes-Benz quality, whether the part is used or new.

We offer a wide variety of used parts for the 1990–2002 Mercedes-Benz SL model. The 500 SL models tend to be the mainstream, but if you have a 300 SL, 320 SL or 600 SL (or, to use the 1994-and-on new designations: (SL 320, SL 500, SL 600) we expect to also have high-quality used parts for you.

You’re probably not surprised that these cars share many components with the W124 series (E Class and T Class) cars, and that we get many of our used parts from such cars.  We do a lot of part number reading, so that you don’t just get an interchangeable part, but the right part.

We personally drive Mercedes-Benz cars.  We know that a large part of the reason they are high-quality is due to the quality of their parts.  Replace these with cheap knock-offs and you have watered down the quality of your Mercedes-Benz, compromising its reliability, safety and/or other aspects.

Body sheet metal, exterior trim, interior trim, seats, engine parts or complete engines, transmissions … whether it’s a planned project or a crisis, we intend to save you thousands of dollars over the life of your Mercedes-Benz SL, making it viable to keep it going indefinitely.

Our fantasy scenario:

Ten years from now, you’re having a conversation with a neighbor who compliments your shining (and now financially appreciated) Mercedes-Benz SL. You say:

“I’m so glad I kept the car going with original Mercedes-Benz parts.  When I could afford it, I bought them new. The rest I got from 129seriesparts.com.  They’re nice, their prices are low and they guarantee what they sell, which is a safe bet for them because they trust the high quality of original Mercedes-Benz parts, even if used.”