Organizational Troubleshooting (continued)
TEST OR INSPECTION
Shut down engine and disconnect battery. Open electrical trays
access door. Remove one wire from generator dc load resistor R4
(11, figure 4-25). Check resistance across load resistor terminals
If resistance is between 4 and 6 ohms, reconnect wire to
resistor and do step 12.
If resistance is not between 4 and 6 ohms, replace resistor
Check wires P23B8 (between dc load resistor R4 and 2CB2) and P21D8N
(between dc load resistor R4 and dc ground stud) for continuity.
If no continuity, replace wire (P23B8 or P21D8N).
If continuity checks good, probable cause of fault is GCU.
The generator is also a possible cause of fault. Replace GCU
Test CURRENT LIMIT SELECTOR switch 1S11 (see malfunction 79).
If switch tests good, do step 14.
Remove battery charger access cover and disconnect main harness
connector P7 from control panel connector J7. Lower control panel
4-38) from GCU. Check
for continuity between
the following points
If no continuity,
replace wire no.