Mobile Generator Output Voltage Troubleshooting
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8.3 Checking the Main Circuit Breaker
Prerequisites Fully-charged battery
Emergency stop switch in disengaged (out) position.
Procedure Follow the procedure below to check the main circuit breaker. As a reminder, place a check
mark next to the answer that applies.
1. With the lug door closed, place the main circuit breaker in the ON position.
Does the main circuit breaker stay in the ON position?
2. With the main circuit breaker in the ON position, open the lug door.
Does the main circuit breaker trip?
3. Open the large hinged panel and disconnect the yellow (Y) wire leading to the shunt of
the main circuit breaker.
4. Place the main circuit breaker in the ON position.
Does the main circuit breaker stay in the ON position?
5. With the main circuit breaker in the ON position, check for continuity (continuity equals
0.0–1.0 Ohms) between L1 of the main circuit breaker and Lug. Also check between L2
and Lug 2, and L3 and Lug 3.
Is there continuity for each check?
6. With the main circuit breaker in the OFF position, check for continuity between L1 of the
main circuit breaker and Lug 1. Also check between L2 and Lug 2, and L3 and Lug 3.
Is there continuity for any of the checks?
7. Reconnect the yellow (Y) wire.
The main circuit breaker has now been checked. Continue with Checking the Voltage
Adjusting Rheostat.
Yes_____ No_____
Continue The main circuit breaker has failed; replace it.
Yes_____ No_____
Continue The main circuit breaker has failed; replace it.
Yes_____ No_____
Continue The main circuit breaker has failed; replace it.
Yes____ No____ Your readings
Continue
The main circuit breaker has
failed; replace it. _____; _____; _____
Yes_____ No____
The main circuit breaker has failed; replace
it.
The main circuit breaker is functioning pro-
perly.
Y
Y
Y
Or
L1 L2 L3
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