Test charging current of alternator (Engine 113) - AR15.40-P-5011GZ

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ENGINE 113 in MODEL 164, 251

Connection diagram

Fig 1: Alternator Charging Current Connection Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	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	All models	AH54.10-P-0001-01A
1	Test regulation voltage of alternator (G2)		AR15.40-P-5010GZ
2	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
	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 running engine	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	AS00.00-Z-0005-01A
3	Start engine
4	Load battery (G1) with volt ampere tester (079) and check charging current of alternator (G2) with increased engine speed	Vary load resistance long enough until the maximum load current is achieved; when this is done, the regulating voltage must not drop below 12.7 V.	*BE15.40-P-1001-01K
		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: ↓ Replace alternator (G2)	*WH58.30-Z-1046-13A
		Model 164	AR15.40-P-5032GZ
		Model 251	AR15.40-P-5032RT
5	Turn off engine
6	Disconnect volt ampere tester (079) with current clamp (065)	Volt ampere tester with load resistance	*WH58.30-Z-1002-09A
		Volt ampere tester ETT 011.00	*WH58.30-Z-1003-09A

TEST VALUES FOR ALTERNATOR

Number	Designation			Engine 113 in models 164, 251, 211.076/276, 215.374, 219.376, 220.074/174, 230.472/474 Bosch
BE15.40-P-1001-01K	Charging current of 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