Commercially available tools
P15.40-2066-06
Connection diagram model 129
030 Engine tester with oscilloscope
065 D.c. clamp
C2 Electrolytic capacitor (alternator/battery harness noise suppressor)
G1 Battery
G2 Generator
M1 Starter
W10 Ground (battery)
W16/2 Major assemblies compartment ground (electrolytic capacitor, noise suppression generator/battery line
X4/1 Terminal block (circuit 30
, interior)
X4/10 Terminal block (circuit 30/30Ü/61e/87L) (6-pin)
br Brown
rt Red
sw Black
Model 129 with engine 119 up to vehicle ident end no. 1F 032 589:
Problems with power supply system - test battery voltage-dependent idle speed increase (refer to Diagnosis Manual Engine Volume 2 Group 07.3).
P15.40-2060-06
Connection diagram model 163
030 Engine tester with oscilloscope
065 D.c. clamp
G1 Battery
G2 Generator
U536 Valid for engines 112/113
W16/4 Ground (output ground - major assemblies compartment - right)
rt Red
sw Black
P15.40-2063-06
Connection diagram model 168
030 Engine tester with oscilloscope
065 D.c. clamp
46 Fuse 46
F1 Fuse and relay box
G1 Battery
G2 Generator
W10 Ground (battery)
X4 Terminal block circuit 30, fuse and relay box/interior, 2-pin
br Brown
rt Red
sw Black
P15.40-2063-06
Connection diagram model 414
030 Engine tester with oscilloscope
065 D.c. clamp
46 Fuse 46
F1 Fuse and relay box
G1 Battery
G2 Generator
W10 Ground, battery center console (interior)
br Brown
rt Red
sw Black
P15.40-2089-06
Connection diagram model 170
030 Engine tester with oscilloscope
065 D.c. clamp
1 Fuse 1 (alternator terminal 30)
F31 Battery fuse box
G1 Battery
G2 Generator
K56 Crash shut-off relay (generator/battery)
M1 Starter
U150 Valid for engine 112
U539 Valid for engine 111 ME-SFI
W16 Ground (component compartment)
X4/10 Terminal block (circuit 30 and circuit 61 at battery) (3-pin)
sw Black
P15.40-2069-06
Connection diagram model 202
030 Engine tester with oscilloscope
065 D.c. clamp
G1 Battery
G2 Generator
M1 Starter
U549 Valid for all except M112
W10 Ground (battery)
X4 Terminal block (circuit 30, left footwell)
X12/3 Terminal block circuit 30/15 unfused, 3-pin
rt Red
sw Black
P15.40-2069-06
Connection diagram model 208
030 Engine tester with oscilloscope
065 D.c. clamp
G1 Battery
G2 Generator
M1 Starter
U549 Valid for all except M112
W10 Ground (battery)
X4 Terminal block (circuit 30, left footwell)
X12/3 Terminal block (circuit 30)
rt Red
sw Black
P15.40-2077-06
Model 210: as of 1.6.99 a fuse for protection of generator is located in the terminal block circuit 30 (X12/3).
Shown on model 210
030 Engine tester with oscilloscope
065 D.c. clamp
G1 Battery
G2 Generator
U93 Valid for in-line engines
W10 Ground (battery)
X4 Terminal block (circuit 30, left footwell)
rt Red
sw Black
1 Connect DC clip-on probe (065) from engine tester with oscilloscope (030) to positive pole of battery (G1)
2 Start engine.
3 Switch on low beam.
4 Assess diode harmonics at 3000 rpm (engine speed).
In this test it is not possible to assess the exciter diodes.
P15.40-0002-01
P15.40-0003-01
P15.40-0004-01
Harmonics if a negative diode is defective (example).
Diode harmonics OK (voltage spikes possible but not important) (example).
Harmonics if a positive diode is defective (example).