06 ELECTRICAL SYSTEM
Page ELECTRICAL SYSTEM - 14
Z001019/0_6_July 2008
SERVICE MANUAL MARINE ENGINES
06.01.04 Check alternator (error detection for BOSCH alternator, 4 cyl. engines)
Trouble features
With engine stopped and ignition on,
generator control lamp (L1) not
shining or only slightly.
With both engine stopped and
running, generator lamp (L1)
constantly shines brightly.
With engine stopped, generator
control lamp (L1) shines brightly,
with engine running only shines
slightly.
Test procedure
Tester lamp connected between B+
and D+ on generator ; shining brightly.
Tester lamp connected between B+
and D+ on generator ; not shining, but
shining brightly when connected
between D+ and ground. Generator
control lamp (L1) does not shine in
both cases.
Tester lamp connected between D+
and ground; tester lamp and
generator control lamp (L1) glowing.
With engine stopped, disassemble
attached governor.
Generator control lamp (L1) still
shining brightly.
Generator control lamp (L1)
extinguishes. Install governor again.
Connect ammeter between B+ and
D+ (on generator). Exciting current
is lower than specified (4 amp
+/- 0,4).
Exciting current is higher than
specified (4 amp +/- 0,4).
Connect tester lamp between B+ and
D+ of generator.
With engine running, tester lamp
extinguishes.
With engine running, tester lamp
glows.
With engine stopped, install new
governor and start engine again.
Tester lamp between B+ und D+
Tester lamp extinguishes
Tester lamp still glows
Error and/or Relief
Generator control lamp (L1) burned
out and/or disconnection in electric
circuit of generator control lamp (L1)
between term. 15 (No. 15000-xx) and
term. D+ (No. 61000-02) on
generator.
Short circuit of a positive diode.
Immediately disconnect starter
battery from generator, otherwise
battery may be discharged on state -
> replace generator.
Error, wipers of governor worn out,
oxid film on slip rings, disconnection
of rotor winding -> replace governor
and/or generator.
Earth short circuit in lead betweeen
generator control lamp and terminal
D+ on generator.
Governor is defective -> replace
governor.
Earth short circuit in the field of
governor and connection DF (see
ill.) of generator, earth short circuit in
rotor winding -> replace generator.
Contact resistance in charging circuit
or in conductor to generator control
lamp (L1)
Governor or generator defective.
Disassembled governor was
defective.
Generator is defective -> replace.
ToC