Onan microlite 4000 generator no output

First verify that the breaker for the outlets is not tripped and make sure that the generator is running at full operating speed. let it run for 5-10 minutes and check for output power. If there is nothing, there are two possible problems. One could be that the automatic voltage regulator is bad. The other is that the field needs to be flashed - a high possibility if the generator has not been run in a long time. There are many videos on the internet that show you how to solve both of these problems. Just do a search for No output from a portable power generator.

It sounds very much like no AC output from the stator to the run circuit, or the main PCB failure

Check the slips rings and brushes, check the stator and rotor windings for continuity and for shorts to ground. Check PCB plug connections. After that you need a new control board

I have the same Gen. An it dont have an oil filter

Try to reset the AC breaker. If no success the field needs to be recharged.

Not sure how to set it up but you can take it and have the voltage turned up on your generator or the voltage regulator is out.

Does it start right back up or does it need to cool off for 10-20 min?

on your generator ther is a reset if thats not it check for fuses if still no then u neda check the wires in the pluges if no then ur generator it self needs re bilt

Check all the ground wires and make sure their not broken or loose. If the wires are good next check the neg. Wire to the coil. Too check the swiitch make sure you have continuity too all the post when the switch in the on position, this requires removing the switch.

Standard 30W motor oil.