Prerequisites for testing Alternator - AR15.40-P-5009I

ENGINE 113.960 /986, 137.970, 275 in MODEL 215

ENGINE 112.922 /944 /975, 113.941 /948 /960 /966 /986, 137.970, 275 in MODEL 220

Connection schematic between battery and alternator

Fig 1: Battery And Alternator - Schematic Circuit Diagram

Fig 2: Identifying Circuit 30 And 61 Terminal Block And Fuse Box

	Check
	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 safety glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Notes on battery		AH54.10-P-0001-01A
1	Open engine hood		AR88.40-P-1000M
2.1	Check fuse for alternator (G2) in circuit 30 and 61 terminal block and fuse box (X4/10)	Except model 220 with engine 137
		Replace if necessary; the complete circuit 30 and 61 terminal block and fuse box (X4/10) must be replaced.
3	Check electrical line terminal 30 for firm seating and a flawless condition	Check at following positions: Battery (G1) Circuit 30 and 61 terminal block and fuse box (X4/10) Alternator (G2)
4	Check electrical line terminal 31 for firm seating and a flawless condition	Check at following positions: Battery (G1) Battery ground (W10) Ground strap between engine and body
5	Check tension of poly-V-belt
6	Inspect condition of poly-V-belt
	Check poly-V-belt in visible area for wear	Engine 112, 113, 137	AP13.22-P-1352Z
		Engine 275	AP13.22-P-1352L
7	Inspect charge indicator in instrument cluster	If charging current is correct, no fault message appears in the display of the instrument cluster.
8	Close engine hood		AR88.40-P-1000M