Lights Do Not Illuminate-Flowchart 1D - WACKER Group LTC 4 Repair Manual

Electrical Troubleshooting Procedures
7.11 Lights do not Illuminate—Flowchart 1D
Checking rotor diodes
With engine shut down, unsolder
the wires from both rotor diodes.
Using the diode scale (
a multimeter, measure voltage
across the diode. Reverse
positions of the meter's leads and
measure voltage again.
in one direction and open
Checking continuity of rotor windings
Check continuity of rotor windings
by measuring resistance across
lead and base of diode.
Check both diodes.
Check rotor winding continuity
to ground by measuring
resistance across lead wire
and rotor shaft.
For a thorough check of winding insulation, use a
megger meter at 500V or have it tested by a motor
repair shop. If after testing more than 2 M Ohms is not
measured, replace the rotor. Consult factory. If continuity
tests are OK, rotor is good. Return to Flowchart 1A.
wc_tx000429gb.fm
) on
Is
0.4–0.5V measured
(OL) in the other?
Yes
Is 2.2 Ohms or
more measured?
Yes
Is there continuity?
No
No
Replace both
diodes.
Replace rotor.
No
Consult with
factory.
Yes
Replace rotor.
96
LTC Repair
wc_gr003068