How do I start my Onan 4000 generator?
Connect the red lead to the back of the circuit breaker (either one), on the terminal farthest away from you. Press and hold the start button for 6 – 8 seconds, and note the voltage. How much voltage is there?
What happens when you release the start button on Onan?
5k onan gen set starts and runs fine [sometimes] then it 5k onan gen set starts and runs fine [sometimes] then it starts and runs as long as you press stsrt button when you release button you loose spark and engine dies .new board and fuel pump … read more Hank F.
Why does the oil pressure switch on Onan generator stick open?
The oil pressure switch of Onan generator often sticks open in case the unit has not seen any use for an extended period of time. In many cases, the situation could be resolved by multiple start/stop cycles, some light tappings should work as well. 2. Defective Control Board
Why does the control board stop the Onan generator?
Generally speaking, the control board regulates primary functions and the most important one is to keep the unit supplied with enough diesel (or LP gas). That means the board would promptly stop Onan generator from working once it detects shortages of fuel and fuel pressure.
What to do if your Onan generator starts then shuts down?
If there is no AC, proceed to check the field flash voltage through the field flash pin of the board. In the case field flash voltage is not present, the control board may be defective. If that happens to be the case, the “Onan generator starts then shuts down” issue could be taken care of by replacing the unit control board.
The oil pressure switch of Onan generator often sticks open in case the unit has not seen any use for an extended period of time. In many cases, the situation could be resolved by multiple start/stop cycles, some light tappings should work as well. 2. Defective Control Board
What should the resistance be on an Onan generator?
Use the multimeter to check the resistance between pins 9 and 10 of the plug, the appropriate reading would be around 22 – 28 Ohms. If the reading is too low, there could be a short in the rotor. On the other hand, if reading is too high, it’s highly likely that there is a ground in the rotor .
Why is my Onan generator producing low AC voltage?
If field flash voltage seems pretty normal, the regulator could be the source of problem which you could determine simply by running 12 volts through a diode to the regulator pin 9. In the case the generator starts producing normal or slightly low AC voltages after that, the regulator is definitely defective.
