Test Alternator Charging Current - AR15.40-P-5011MFG

Engine 139 in model 118, 177, 247 

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

Shown on model 177 

	Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove
1	Switch off ignition and store transmitter key outside of transmitter range (min. 2 m).
2	Remove lower engine compartment lining.		AR61.20-P-1105MFR
	Check
3	Check poly-V-belt in visible area for signs of wear.	Engine 139 in model 118, 177, 247
		Engine 139 in model 118, 177	AP13.22-P-1352C
4	Check electric lines at starter battery (G1), starter battery ground point (W10) and electric line at starter for tight seating and fault-free condition.
5	Check that electric lines at alternator (G2), at starter and alternator line connector (X5/4) and at left front wheel arch earth point (W3/2) are firmly seated and in fault-free condition.
6	Check that ground strap between transmission mount and body is seated tightly and is in perfect condition.
7	Connect load tester (079) according to connection scheme.
8	Connect current clamp (065) to electric line (1).
9	Start engine.
10	Load on-board electrical system battery (G1) with the load tester (079) and check charging current at increased engine speed.	Change load resistance until max. charging current is achieved; in this connection, charging voltage may not fall below 12.7 V. Charging current for alternator	*BE15.40-P-1001-01L
11	Check alternator diodes (G2).		AR15.40-P-9301-02MFG
12	Switch off engine.
	Install
13	Remove load tester (079) with current clamp (065) from vehicle.
14	Install lower engine compartment lining.		AR61.20-P-1105MFR