Mercedes-Benz ML320. Manual — part 394

Test values for generator charge indicator lamp

CHECKING REGULATION VOLTAGE OF ALTERNATOR - AR15.40-P-5010GH

ENGINES 111.977, 112.942/970, 113.942/965/981, 612.963, 628.963 in MODEL 163

to vertical position

As of A145273, X708319. AR88.40-P-1000GI

Testing

2

Check electrical line
terminal 30 to the following
items for firm seat and
flawless condition



Battery (G1) (+)



Generator (G2)(B+)

3

Check electric cable for
circuit 31 at the following
positions for correct seat
and condition



Battery (G1) (-)



Right major assemblies
compartment ground,
Common ground
(W16/4)



Engine ground
strap/body

4

Inspect tension of poly V-
belt

5

Inspect operation of charge
indicator in instrument
cluster

*BE54.30-P-1001-01A

6

Install in the reverse order

Number

Designation

Model 129, 163, 168,
170, 202, 203, 208, 210

BE54.30-P-1001-01A

Position of ignition / glow
start switch

Charge indicator lamp

Off

0/1

Charge indicator lamp On 2

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Fig. 30: Identifying Connection Diagram - Checking For Alternator Regulation Voltage

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
safety glasses. 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 condition of
battery (G1)

AR54.10-P-1129Z

2

Check whether
preconditions for
alternator testing have
been fulfilled

AR15.40-P-5009GH

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

Risk of accident caused Secure vehicle to prevent it AS00.00-Z-0005-01A

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

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

from moving by itself.
Wear closed and snug-fitting
work clothes.
Do not grasp hot or rotating
parts.

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 111, 112, 113

*BE15.40-P-1001-02A

Engines 612, 628

*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

Engine 628

Engines 111, 112, 113



Replace alternator
(G2)

AR15.40-P-5760GH

Engine 612

Regulation voltage < 13.0

V: ?



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

Electrical connections OK: ?

AR15.40-P-5032GI



Check alternator (G2)
diodes

AR15.40-P-9301-02EA

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me

Check values for regulator

Check values for regulator

Commercially available tools

CHECKING CHARGING CURRENT OF ALTERNATOR - AR15.40-P-5011GH

Engine tester with
oscilloscope
If diodes are faulty: ?



Replace alternator
(G2)

*WH58.30-Z-1046-13A

Engine 111, 112, 113

AR15.40-P-5032GH

Engine 612

AR15.40-P-5032GI

Engine 628

AR15.40-P-5032IA

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 approx.2

Number

Designation

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

Engine 612
except 612.966

BE15.40-P-
1001-02C

Regulating
voltage (at
battery)

Loading: only on
permanent
consumer

V 13 to 15

13 to 15

Engine speed

rpm 3000

3000

measured after

min approx.2

approx.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

2001 Mercedes-Benz ML320

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

me