Aftermarket Copper / Brass Fuse Upgrade Kit


Early vintage Mercedes vehicles, including earlier R129 roadsters, use older style ceramic fuses, dating up to the early 90s. These fuses are 6mm X 25mm in size and are made with a ceramic base and an aluminum fusible element. The fuse boxes have copper seats and contact arms which lock the fuses firmly into place. The weakness of this design is the development of corrosion around the contact points where two dissimilar metals meet.

Although it may not be easily visible, rings of corrosion form around the contact points causing poor contact, and eventual fuse failure. Faulty contact leads to erratic electrical issues affecting several functions within the vehicle. For the R129, fuse #9 is responsible for instrument failure during signaling, convertible top retraction failure, and various other issues.

Nearly unnoticeable, after a quick scrub, this early R129 fuse is indeed faulty Copper contacts and aluminum ceramic fuses cause corrosion


Fortunately a simple solution exists. Available from a leading German OEM and aftermarket electrical product company is a copper/brass ceramic fuse upgrade kit. The copper/brass element is naturally compatible with the copper contacts of the fuse holders so corrosion is avoided, yet still retaining the correct fast-blow nature of the fusible element.

All fuses included in the kit, are sufficient for upgrading the complete contents of the fuse box, with several spares remaining. Simply clean fuse-box contact surface with a fine wire brush, and replace fuse with equivalent copper/brass rating. Note: Ensure battery is disconnected while replacing fuses!


According to the fuse designation usually printed underneath the fuse-box housing, the fuse breakdown for various models are summarized below:

R129 Fuse Designation
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *
white 8 18 20
red 16 4 10
blue 25 2 10

W201 Fuse Designation
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *
white 8 15 20
red 16 5-7 10
blue 25 0 0

W126 Fuse Designation - Gen I
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *

white

8

11

20

red

16

3

10

blue

25

6

10


W126 Fuse Designation - Gen II
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *

white

8

13

20

red

16

4

10

blue

25

4

10


W124 Fuse Designation
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *
white 8 11 20
red 16 6 10
blue 25 5 10

W123 Fuse Designation
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *
white 8 9 20
red 16 8-9 10
blue 25 0-1 10

W116 Fuse Designation
Fuse Colour Amperage Quantity Needed Quantity In Kit
yellow 5 0 0 *
white 8 8 20
red 16 7 10
blue 25 1 10

* 5A fuses are not used for typical Mercedes applications,
although, they are still available for purchase for other vehicles


Fuses can be included in the return package if your instruments are currently being serviced, otherwise consult mailing prices below.


Installation


Upon receipt of the new fuse kit, take some time to familiarize yourself with the existing fuse layout inside the fuse box. There should be a fuse map on the underside of the cover, if not, use the appropriate map as indicated above. Carefully note the correct fuse layout as defined by the map to ensure that the fuses, colours, and locations correspond as indicated. Once certain you can reproduce the existing layout, perform the following :
  1. Disconnect the battery and ensure the ignition is in the off position.
  2. Take a digital camera photo of the existing layout, to compare it against your finished work.
  3. Remove all the fuses and discard. Clean, unused fuses, can be kept for backup.
  4. Using a small square of sandpaper, sand the underside of the fuse contact pads. This will be awkward to do with the positioning of the box, but persistence will pay off! All old corrosion needs to be sanded off cleanly.
  5. Using the fuse map, carefully seat the new copper fuses into the correct positions. A set of mini-pliers can be useful here, carefully avoiding damage to the copper fuses!
  6. Once all fuses have been seated correctly, double check your work against your backup picture, and fuse map.
  7. If everything checks out, reconnect your battery.


NOTICE


Unfortunately due to a lack of demand, MBCluster will no longer be stocking the copper fuse upgrade kit. However, those owners who are still looking for this product can find the individual fuses themselves in bulk from Ebay, and various other suppliers. Fuses are typically sold in bulk, 100 pcs per box. Online suppliers such as Maryland Metrics carry the fuses in bulk.

The correct fuse part#s are as follows :

Fuse Colour Amperage Flosser Part#
yellow 5 114805
white 8 114808
red 16 114816
blue 25 114825

The following is an excerpt from the 2014 Maryland Metrics: Flosser Price List :

114805 Ceramic fuse 5 Amp $0.11 100       8JS 704 073 801     Fuse
114808 Ceramic fuse 8 Amp $0.11 100       8JS 025 889 801     Fuse
114816 Ceramic fuse 16 Amp $0.11 100       8JS 089 015 801     Fuse
114825 Ceramic fuse 25 Amp $0.11 100       8JS 091 603 801     Fuse



Email : Info@MBCluster.com

MBCluster | 8 Blacktoft Drive | Scarborough, Ontario, Canada | M1B 2M6 | (416)724-2149 | Email : Info@MBCluster.com

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