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Mercedes W123 Battery Ground Cable Replacement

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  1. Mercedes W123 Battery Ground Cable Replacement, Disconnect the battery: crwdns2935265:01crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Mercedes W123 Battery Ground Cable Replacement, Disconnect the battery: crwdns2935265:01crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • Start by disconnecting both battery terminals, beginning with the negative (-) side, which travels just a few inches to a bolt attaching the other end to the car's body.

    • Never remove your positive (+) cable first or you risk injury from electric shock.

  2. Mercedes W123 Battery Ground Cable Replacement, Remove the old ground cable: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Loosen and remove this 13mm bolt that holds the cable to the metal of the car's chassis.

    • Now remove the old ground cable.

  3. Mercedes W123 Battery Ground Cable Replacement, Install the new cable: crwdns2935265:03crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Mercedes W123 Battery Ground Cable Replacement, Install the new cable: crwdns2935265:03crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • You can see here that the new ground cable is substantially thicker. It is a 2 gage cable. The ends are also crimped better, protecting the inner wire from corrosion.

    • This cable is also a bit longer than the old one, giving some more wiggle room.

  4. Mercedes W123 Battery Ground Cable Replacement: crwdns2935265:04crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Install the new ground cable, using the new captive bolt, and nut, that came with it.

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Once you've finished, consider covering the terminal where the cable attaches to the battery in a silicone dielectric grease to prevent corrosion.

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Nicolas Siemsen

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