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Test alternator charging current - AR15.40-P-5011RKA

ENGINE 276 in MODEL 231 

Connection scheme 

Fig 1: Testing Alternator Charging Current
G11128500Courtesy of MERCEDES-BENZ USA
INSPECT Check    
1 Check poly-V belt tension    
2 Check poly-V belt for wear    
REFER TO MAINTENANCE Check visible area of poly-V belt for wear   AP13.22-P-1352EW
3 Check electrical lines to on-board electrical system battery (G1), alternator (G2), starter (M1) and on the ground point for the battery (W10) in engine compartment for firm seating and check for a perfect condition    
4 Remove lower engine compartment paneling   AR61.20-P-1105RK
5 Check ground strap between engine and body for tight seating and proper condition    
6 Connect volt amp(s) tester (079) with current clamp (065) according to connection diagram    
DANGER 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
7 Start engine    
8 Check charging current at high engine revs; apply load to on-board electrical system battery (G1) for this step using volt-amp(s) tester (079) IMPORTANT Change the load resistance until the maximum charging current is reached. The regulation voltage must not drop below 12.7 V.  
Charging current of alternator
Check for the diodes of the ALT (G2) charging current under the specified value:
↓
*BE15.40-P-1001-01L 
Test alternator diodes
In the case of defective diode, replace alternator (G2):
↓
AR15.40-P-9301-02RKA
    Remove/install alternator AR15.40-P-5032RKA 
9 Turn off engine    
10 Disconnect volt amp(s) tester (079) with current clamp (065)    
CHECK VALUES FOR ALTERNATOR

Number Designation ENGINE 276 in MODEL 231
BE15.40-P-1001-01L Charging current of alternator max. A 180
min. A 140
Engine speed 1/min 2000
Gear ratio i= 2, 93