Ford LRG-423 User Manual

03-73
Auxiliary Systems
03-73
GENERATOR DIAGNOSIS AND TESTING (Continued)
Symptom Chart
CONDITION
POSSIBLE SOURCE
ACTION
l Dead battery. Battery will not stay
l Key-off battery drain.
l Go to Pinpoint Test A.
charged. Slow crank. Low battery
l Open/voltage drop in B+, Circuit 38
voltage. No generator output.
(BWO), 290, and 37.
l Open voltage drop in A, Circuit 36
ww -
l Open/high resistance in I, Circuit 904
(LG/R).
l Voltage regulator.
l Generator.
l Indicator lamp on with engine running.
l Open A, Circuit 36 (Y/W).
l Go to Pinpoint Test B.
l Shorted I, Circuit 904 (LGIR).
l Open/high resistance in S, Circuit 4
(W/BK).
l Voltage regulator.
l Generator.
l Indicator lamp flickers or intermittent.
l Loose connection to generator, voltage
l Go to Pinpoint Test C.
regulator battery.
l Loose fuse or poor connection in Circuit
36 (Y/W).
l Loose brush holder screw.
l Voltage regulator.
l Generator.
l Battery over-charging (Battery voltage
l Voltage drop in A, Circuit 36 (Y/W).
l Go to Pinpoint Test D.
greater than 15.5 volts).
l Voltage drop in I, Circuit 904 (LG/R).
l Poor ground.
l Voltage regulator.
l Generator.
l Indicator lamp off, key on, engine not
l Open/high resistance in I, Circuit 904
l Go to Pinpoint Test E.
running.
(LG/R).
l Burned out bulb.
l Poor ground.
l S, Circuit 4 (W/BK) shorted to B+.
l Voltage regulator.
l Generator.
l Generator noisy.
l Accessory drive belt.
l Accessory brackets.
l Bent generator pulley.
l Generator.
l Other components.
l Go to Pinpoint Test F.
l Indicator lamp on, key off.
l Lamp circuit, (GYMI) shorted to B+.
l Go to Pinpoint Test H.
l Improper lamp circuit wiring.

Ford LRG-423 Specifications

General

Brand	Ford
Model	LRG-423
Category	Engine
Language	English