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Disconnect and disconnect ground line from on-board electrical system with one battery - AR54.10-P-0003-02SX

DANGER Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers. AS54.10-Z-0001-01A
DANGER Notes on battery AH54.10-P-0001-01A

Shown on model 221 

Fig 1: Identifying Ground Line And Negative Terminal Of On-Board Electrical System Battery
G07594029Courtesy of MERCEDES-BENZ USA
  1. Loosen nut on ground line (1) and remove ground line (1) from negative terminal of on-board electrical system battery (G1).

    NOTESInstallation:  Ensure that the ground line (1) is seated tightly, otherwise the electrical system may be damaged.

  2. Connect in reverse order.