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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14563
Experience:  Certified on Onan and Generac generators
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Have a 1984 Itasca motor home with 4.0 onan genator runs

Customer Question

Have a 1984 Itasca motor home with 4.0 onan genator runs great but not puting out any power. segestions on what to check.
Submitted: 7 months ago.
Category: Small Engine
Expert:  Hank F. replied 7 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

If the genset is running, it is putting out power.

First check the circuit breaker on the genset - make sure it is turned on.

If the breaker is on, if you have an onboard receptacle for genset power, make sure your shore cord is plugged in.

If you have an automatic transfer switch, it is very possible that it is bad.

The other place to look for trouble is inside the junction box located near the genset.

Customer: replied 6 months ago.
The breakers are all ok, not sure where this auto transfer switch is doesn't appear to have a onboard receptacle. going to take it to cummings in St. Paul for help. The reset button on the gen doesn't doesn't stay In,, comes back out, don't know if this a problem, seems not many people know about these gens.
Expert:  Hank F. replied 6 months ago.

What is the full model number of the genset?

Customer: replied 6 months ago.
model # 4.OBFA-1R/1601oc the R might be a A hard to read. Serial # E833675445
Expert:  Hank F. replied 6 months ago.

The letter will be "R". The code 1R means that the genset is set up for remote start.

If the genset is running, it should be producing power. If it is not producing power, it would shut off as soon as you released the start switch.

You can easily check, though, by simply opening up the control box, and testing for voltage directly at the back of the circuit breaker with the unit running.

Follow the genset leads. They will lead to a junction box that is usually right next to the genset. Make sure that the connections inside the junction box have not come loose.

If they are good, follow your shore cord. It will lead right to the transfer switch.

If you have good genset power going in to the transfer switch, but nothing coming out, the transfer switch is bad.

Also, another thought. Some of these older coaches did not have a transfer switch or a receptacle. Some had a manual switch inside the coach. Check to see if you have one of those, and if it is in the correct position.

Expert:  Hank F. replied 6 months ago.

Was this what you wanted to know?

Customer: replied 6 months ago.
Well it was some help but I'll take it to cummings on the 15 cause just can't figure it out. The guy said some of the older models will still run without generating.
Expert:  Hank F. replied 6 months ago.

Yes, some of them would run, but the BFA has a relay in it that must receive AC power to keep the unit running.

If no AC is being produced, the relay will not close, and the unit will shut down - unless someone has done some rewiring and bypassed the relay.