Test charging current for alternator (Engine 156) - AR15.40-P-5011GZS

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ENGINE 156 in MODEL 164, 251

Connection diagram

Fig 1: Alternator Charging Current Connection Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

MODIFICATION NOTES

21.6.06

Charge current for alternator

Engine 156 in model 164, 204, 209, 211, 219, 230, 251

*BE15.40-P-1001-01I

	Checking
	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 goggles. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Notes on battery		AH54.10-P-0001-01A
1	Check tension of poly-V-belt
2	Check poly-V-belt for wear
	Check poly-V-belt in visible range for wear		AP13.22-P-1352GZ
3	Check the electrical lines at the battery (G1), alternator (G2) and starter (M1)	Tight seating and proper condition of the cables must be guaranteed.
4	Remove lower engine compartment paneling	Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT
5	Check ground strap between engine and body for tight seating and proper condition
6	Connect volt ampere tester (079) with current clamp (065) according to connection diagram	Volt ampere tester with load resistance	*WH58.30-Z-1002-09A
		Volt ampere Tester ETT 011.00	*WH58.30-Z-1003-09A
		Current measurement pliers	*WH58.30-Z-1016-09A
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
7	Start engine
8	Load battery (G1) with volt ampere tester (079) and check charging current of alternator (G2) with increased engine speed	Vary load resistance until maximum charging current is reached; the regulation voltage must not fall below 12.7 V.
		Charge current for alternator	*BE15.40-P-1001-01I
		Volt ampere tester with load resistance	*WH58.30-Z-1002-09A
		Volt ampere Tester ETT 011.00 Charging current below desired value: ↓	*WH58.30-Z-1003-09A
		Check diodes for alternator (G2).	AR15.40-P-9301-02GZ
		Current measurement pliers	*WH58.30-Z-1016-09A
		Engine tester with oscilloscope If diodes are faulty: ↓	*WH58.30-Z-1046-13A
		Replace alternator (G2).	AR15.40-P-5032GZS
9	Turn off engine
10	Disconnect volt ampere tester (079) with current clamp (065)
11	Install lower engine compartment paneling	Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT

CHECK VALUES FOR ALTERNATOR

Number	Designation			Engine 156 in model 164, 209, 211, 219, 251
BE15.40-P-1001-01I	Charge current for alternator	max.	A	180
		min.	A	140
		Engine speed	RPM	2000
		Ratio	I=	2.93

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1002-09A	Volt-amp(s) tester with load resistance (no longer available)
WH58.30-Z-1003-09A	Volt ampere tester
WH58.30-Z-1016-09A	Clamp-on probe
WH58.30-Z-1046-13A	Engine tester with oscilloscope