There are two fuse boxes. The first is located under the hood on the driver's side of the engine compartment.
The second is located inside of the cabin of the vehicle on the passenger side down by where your feet go.
Update of answer.
I have a 1999 Mercedes Benz ML 320 which should be identical to the 2000. I have heard many web sites say that their is a second fuse box or the "E" box located on the passenger side where your feet go. This is simply not true.
Most people may be looking for the "E" fuse box as they blew a fuse for their power seats. To access the "E" box take the cover off of your fuse box. Then to the rear of the main fuse box their is a second larger cover with five screws that is a cover for the computer and wiring harness. You will need a special star head screwdriver. When you remove that cover, you will find a couple of additional fuses. Two of these fuses are for the ML320 power seats.
No where on the web did I find a proper answer for this question. And no where in MB documents did they note the location of these fuses.
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A 2000 Mercedes Benz C230 has several fuse boxes located inside the vehicles engine compartment. The horn fuses, there are two, are located in the fuse box next to the master cylinder. The fuse numbers are 40 and 41.
You can get a 2004 Mercedes-Benz fuse panel diagram at most Mercedes-Benz dealerships. You can also get the diagram from Mercedes-Benz service manuals.
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The horn fuse, for your Mercedes ML 320, can be found in the fuse box in the engine compartment. A diagram of the fuses will be on the inside of the fuse box cover.
Under hood on left side under black box with 2 snap holders in the front of box unsnap then pick up box top. Gene Terenzio Sr. 2000 ML 320 owner
In the fuse box.