Disconnect and disconnect ground line from on-board electrical system with one battery - AR54.10-P-0003-02SXS - 2 of 2

	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
	Notes on battery		AH54.10-P-0001-01A

Fig 1: Identifying Ground Line And Negative Terminal Of On-Board Electrical System Battery (Shown On Model 221)

Courtesy of MERCEDES-BENZ USA

Shown on model 221

Loosen nut on ground line (1) and remove ground line (1) from negative terminal of on-board electrical system battery (G1).
Installation: Ensure that the ground line (1) is seated tightly, otherwise the electrical system may be damaged.
Using a diode test lamp, check the electrical system for voltage between the positive line of the on-board electrical system battery (G1) and the disconnected ground line (1).
If the diode test lamp lights up, the on-board electrical system is still active because of a defect in the electrical system.

In this case the ground line of the additional battery should be disconnected.

After this the electrical system is to be repaired upon completion of the work carried out.
Connect in reverse order.