TJKeller.xyz Fuse Box Diagram Card Insert Replacement for Mercedes Benz W126 (Late Model)
July 27, 2026
Tags: Mercedes Restoration W126

Fuse Box Diagram Needed

Recently, I decided to fix the odometer and clock on my 1989 Mercedes 300SE. The clock capacitor and odometer gears had been long defective (in addition to the odometer caps). Certain as I was that the clock had been fixed since I had ran it off of the 12v rail on an ATX power supply all night, it still didn’t tick on like I had expected. Just a fuse of course, but which fuse? There are 24 of them just sitting here unlabeled! None of them obviously bad. So which one controls the clock? Just a Google search away, right? No, of course not! Everyone knows Google is as good as useless nowadays! Several wasted minutes (and megabytes) later, I find a diagram for my car – great! A blurry jpeg scan of the card that clips into the top of the fuse box lid.

I guess I’ve never been smart enough to bookmark decent diagram, but I am smart enough that there had to be a better way. That’s probably why Mercedes had the wisdom to put a diagram there in the first place. Only problem is that there isn’t one available to just print out – that is, until now!

SVG Recreation

Mercedes Fuse Box Insert 126.545.21.00

This is my SVG recreation of the fuse box insert. Simply download it, print it on cardstock at 100% scale, and slide it into your fuse box cover!

Example cover with printed insert

The part number of this insert is 126.545.21.00. It’s based on this scan from the benzworld forum.

It’s not an exact recreation, for instance it uses the Inter typeface because a. I like it, b. it’s free, and c. I didn’t care to figure out the original font. But this is close enough for a hastily done attempt. I made it in inkscape. I used an OCR tool for a lot of the text, so if it isn’t accurate then send me an email and I will fix it.

The funny thing is, people are charging about $20 for one of these on ebay right now. Granted, that is probably for an original, but still it is outrageous how much people will charge for a piece of paper that you can easily print out yourself. Feel free to try out that gambit for yourself selling these, but kindly donate some BTC if you happen to make it big selling paper cutouts of my SVG.

Download

Click on the link, then ctrl+p to print. Ensure scale is set to 100%, Then cut along the dotted lines!

Fuse Table

For completeness sake, here is a table containing the same information as displayed on the card verbatim. Bookmark this page so you don’t lose it!

Fuse Rating Description
1 16A (red) (auxilary fan)
2 8A (white diagnostic term, 6
hazard warning system, clock,
front roof light
(electronic radio, vanity mirror light,
relay comfort circuitry term. 86,
electr. illum. control)
3 30A heatable rear window
4 8A (white) low beam right
5 8A (white) back-up lamp, heating water valves,
water pump, climate control system
(relay auxiliary fan term. 86, aut.
transmission electrics, blower motor
inside temperature sensor, air condition
compressor electromagn. clutch/valve
air injection)
6 8A (white) stop lamp, instrument’ front roof light,
electric bulb control unit (cruise control,
tachometer, hydropneumatic
suspension)
7 8A (white) turn signal lamp,
horn
(outside temperature gauge)
8 16A (red) safety belt handover arm (adjustablet
heated outside mirrors, rear cigar
lighter, rear seat heating)
9 8A (white) parking/tail light left
10 8A (white) fog light, rear fog light
11 8A (white) parking/tail light right, warning buzzer,
illumination: license plate, instrument,
control elements (headlamp cleaning
unit)
12 8A (white) low beam left
13 8A (white) high beam right, high beam indicator
14 8A (white) high beam left
15 8A (white) roof light rear,
trunk light,
safety belt handover arm,
switch over valve seat back arrester
(central locking system,
door lights,
reading lamps/rear compartm.,
aut. antenna,
control unit seat adjustment memory)
16 25A (blue) blower motor
17 16A (red) wipe/wash system, optical horn,
(relay headlamp cleaning unit term. 86,
relay comfort circuitry term. 86)
18 8A (white) heating system for washer jets,
cigar lighter,
glove compartment light
switch heatable rear window (radio)
19 16A (red) (sliding roof, front seat heating,
ortho. back rest)
A 25A (blue) (front seat adjustment,
jacket tube adjustment-memory)
B 25A (blue) (front seat adjustment,
jacket tube adjustment)
C 25A (blue) (window lift front left a. rear right,
rear seat bench adjustm. resp.
rear single seat adjustm. left)
D 25A (blue) (window lift front right a. rear left,
rear single seat adjustm. right)