Mobile Generator Output Voltage Troubleshooting
wc_tx000726gb.fm 73
8.5 Checking the Auxiliary Winding
Prerequisites Generator shut down
Procedure Follow the procedures below to check the auxiliary winding.
1. Open the large hinged panel and locate the Automatic Voltage Regulator (AVR).
2. Disconnect the red wire from the AVR.
3. Disconnect the red wire from the blue wire of the lug door switch.
4. Measure the resistances across the two red wires.
Is 1.7–2.7 Ohms measured?
5. Check each red wire for continuity to ground.
Does each wire measure “OPEN” or “OL” to ground?
6. Reconnect the wiring.
The auxiliary winding has now been checked. Continue with Checking the Exciter Stator.
Yes____ No____ Your reading
Continue Remove the vent cover from the generator and
check the generator for damage.
Yes____ No____ Your reading
Auxiliary winding
is OK.
Remove the vent cover from the generator and
check the generator for damage.
Blue
Red
Red
Red
Red
wc_gr003692
L/W
VOLT
B
R
GYL
5C
AMP HZ STAB
5B 7 5A 6 5 4A 4 3A 3 2 1
n/a
n/a
AVR
1000
200
20
2
200m
F
V
A
V- COM
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