Output Voltage Troubleshooting Mobile Generator
wc_tx000726gb.fm 72
8.4 Checking the Voltage Adjusting Rheostat
Prerequisites Generator shut down
Procedure Follow the procedure below to check the voltage adjusting rheostat.
1. Open the control panel and locate the voltage adjusting rheostat.
2. Disconnect the voltage adjusting rheostat from the automatic voltage regulator (AVR).
3. Loosen the rheostat’s locknut.
4. Measure the resistances of the rheostat across the entire range of its travel.
Does the voltage adjusting rheostat have a range of at least 5–145k Ohms (5-95k for 100k
Ohm pots)?
5. Check each wire to ground (unpainted surface on door).
Does each wire measure “OPEN” or “OL” to ground?
6. Reconnect the voltage adjusting rheostat.
7. Tighten the rheostat’s locknut.
The voltage adjusting rheostat has now been checked. Continue with Checking the Auxi-
liary Winding.
Yes____ No____ Your reading
Continue The voltage adjusting rheostat has failed;
replace it.
Yes____ No____ Your reading
The voltage adjusting
rheostat is OK.
The voltage adjusting
rheostat has failed;
replace it.
L/W
G Y L
4A 4 3A 3 2 1
n/a
n/a
0009369 >124
0009459 >129
0620003 >133
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