Checking regulation voltage of alternator

AR15.40-P-5010EA

Checking regulation voltage of alternator

14.2.12



Checking

 Danger!

Risk of explosion caused by escaping oxyhydrogen gas. Risk of injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte (contains diluted sulfuric acid) or metal spatter due to short circuit. Risk of burn injuries caused by short circuit. Risk of poisoning caused by swallowing battery electrolyte (contains diluted sulfuric acid) or absorption of lead over the skin or orifices

No fire, sparks, open flames or smoking.

Wear acid-resistant gloves and clothing and safety glasses with side guards.

Do not place any conductive objects on the battery and avoid any short circuit from battery positive to ground.

Only fill liquid battery electrolyte (diluted sulfuric acid) into suitable and appropriately marked containers.

AS54.10-Z-0001-01A



Notes on battery

AH54.10-P-0001-01A

1

Check condition of battery (G1)

AR54.10-P-1129Z



Battery version modified (non-woven battery)

 An AGM battery is used in model 202.028/121/128

from 1.1 97, for a limited period of time.

BT54.10-P-0001-01A

2

Prerequisites for testing alternator

AR15.40-P-5009EA

3

Attach volt ampere tester (079) according to connection plan

 Volt ampere tester with load resistance

*WH58.30-Z-1002-09A

 Volt ampere tester ETT 011.00

*WH58.30-Z-1003-09A

 Danger!

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

4

Start engine

5

Check function of charge indicator lamp when engine is idling and with increasing engine speed (up to 3000 rpm)

 Charge indicator lamp must extinguish.

6

Load battery (G1) using a permanent consumer and check regulation voltage of alternator (G2)

Engines 104, 111, 112, 113

*BE15.40-P-1001-02A

Engines 601, 604, 605, 611

*BE15.40-P-1001-02C

 Volt ampere tester with load resistance

*WH58.30-Z-1002-09A

 Volt ampere tester ETT 011.00

*WH58.30-Z-1003-09A

Regulation voltage > 15.0 V:

 Replace regulator

AR15.40-P-5760EA

Regulation voltage < 13.0 V:

 Check electrical connections for charging system for transition resistances; repair if necessary.

Electrical connections OK: 

 Check alternator (G2) diodes

AR15.40-P-9301-02EA

Engine tester with oscilloscope

*WH58.30-Z-1046-13A

If diodes are faulty: 

 Replace alternator (G2)

Engines 104, 111, 601, 604, 605, 611

AR15.40-P-5032EA

Engine 112 and engine 113 in model 208

AR15.40-P-5032EB

7

Turn off engine

8

Disconnect volt ampere tester (079)

 Volt ampere tester with load resistance

*WH58.30-Z-1002-09A

 Volt ampere tester ETT 011.00

*WH58.30-Z-1003-09A

Number

Designation

Engines
103, 104, 111, 112, 113, 119, 120, 137, 155,
166, 275

BE15.40-P-1001-02A

Regulating voltage
(at battery)

Loading: only on permanent consumer

V

13 to 15

Engine speed

rpm

3000

measured after

min

2

Number

Designation

Engines
601, 602, 603, 604, 605, 606, 611, 613, 628, 646, 647, 668

BE15.40-P-1001-02C

Regulating voltage
(at battery)

Loading: only on permanent consumer

V

13 to 15

Engine speed

rpm

3000

measured after

min

2

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-1046-13A

Engine tester with oscilloscope