Electrical Troubleshooting Procedures LTC Repair
wc_tx000429gb.fm 96
7.11 Lights do not Illuminate—Flowchart 1D
wc_gr003068
No
Ye s
Is
0.4–0.5V measured
in one direction and open
(OL) in the other?
Replace both
diodes.
No
Ye s
Is 2.2 Ohms or
more measured?
Replace rotor.
Consult with
factory.
Ye s
No
Is there continuity?
Replace rotor.
Check rotor winding continuity
to ground by measuring
resistance across lead wire
and rotor shaft.
Checking rotor diodes
With engine shut down, unsolder
the wires from both rotor diodes.
Using the diode scale ( ) on
a multimeter, measure voltage
across the diode. Reverse
positions of the meter's leads and
measure voltage again.
Checking continuity of rotor windings
Check continuity of rotor windings
by measuring resistance across
lead and base of diode.
Check both diodes.
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.
To Next Page
Loading...