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Onan generator cranks then wines no start i have a onan generator in my motorhome it stop running now when i try to start in it turns over but does not run what should i9 cheack

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Check oil level in the sump
if the oil level is correct check for a problem oil level sensor circuit
it is there to stop the engine when the oil level reaches critical level

Posted on Dec 12, 2016

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My RV has a Onan Emerald 5000 Genset Generator. I will start it and it will start after 3 times cranking it. Runs fine. Turn it off. Then try to start it again and I get nothing. No trying to crank.


associated problems here are
low oil sensor system faulty
fuel flow insufficient-- blocked fuel tap /filter in tap
problem wiring in the coil area--stop switch
problem ignition control module
take it to a generator repair shop/ mower repair shop for a proper diagnosis and quote

Sep 06, 2016 | Electrical Supplies

2 Answers

My generator will turn over but wont start


Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta

Mar 30, 2014 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Starts runs for a minutes quits but if you keep pushing the start button it keeps running


You say Guardian that is Generac???? Then you indicate Onan 4.0KY. If it is a Onan and it stops after you release the button there are a couple of things. 1 st check the brushes, and polish the rotor slip rings, check the resisitance of the rotor, the electrical harness plugs are tight. The control requires a voltage feedback while cranking to engage the PCB run circuits, if all those check out you have a bad control board.

Feb 15, 2013 | Onan Cummins 4.0 KY-FA/26100 RV QG 4000...

1 Answer

Have a 2.0kva-fr/26119 onan genorator which runs for 5 minutes and stops can you be of any help


If it stops after 5 minutes whether under load or not, and assuming the air filter, plugs, and fuel filter are new and or clean. The fuel pump is suspect. If it is in a motorhome try conencting it to an external fuel source that is at the same height as the generator. Then higher than the generator. If the problem persisits replace the fuel pump. Or just check fuel pump pressure with a gauge. BE CAREFUL do not use an automotive fuel pump Onan have special low pressure pumps, so use OEM part

Nov 13, 2012 | Onan Cummins 300-5332 Generator Switch and...

1 Answer

My onan emerald 1 genset is not transfering charge to the battery


Assuming your generator has the battery charger option?
Measure the battery voltage at the battery lead in the generator, without the unit running, or the motorhome ignition on. It should read approx 12V after the unit has been sitting a while. Then start the generator, it should rise to approx 13.8 with a good battery. If it does not then the stator windings and charge rectifier in the generator should be checked. If the voltage is 13.8 approx with the generator then you problem lies further upstream, and possibly with an isolation solenoid. If you generator does not have a battery charge winding/option then charging comes from the line voltage via a motorhomes inverter, check the inverter.

Sep 08, 2012 | Onan RV QG, 2500W GenSet, LP Gas

1 Answer

We have an rv with a onan emerld I set generator on board. When we bought the rv (used) the generator did not work at all. We purchased the motherboard for it and it now starts and runs fine but we are not...


Is your generator wired in to an automatic switchover in the motorhome, or do you have external plug in on face of generator, or near it. The power from the generator needs to be attached one way or another to the motorhome. It may be as simple as plugging the cord from motorhome into it, depending on what set-up you have.

May 16, 2010 | 1983 Chevrolet Chevy

1 Answer

I have a 1984 winnebago motrhome with a 6500nh rv onan generato runs getting power on the line but none in the motorhome


Hooked in to motorhome via automatic switchover, or does the power plug of motorhome have to be plugged in to receptacle at or near generator?

Mar 15, 2010 | Watts Onan Portable Generator - 5000 ,...

1 Answer

Onan Generator stopped working in motorhome because the gas got too low. I blew out the front fuel filter,changed oil and filter, air filter, one spark plug and now it won't start. Is there a fuel shut...


Yes it wil not let you run your motorhome out of fuel they set it up that way so you dont strand yourself you may have a air bubble in the fuel line to the generator try blowing air generator fule line back into the tank

Jan 31, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan 4kw Emerald I generator will not crank


The gen. is not the problem, the engine start circuit is not functioning. You need to look at the starter solenoid and starter.

Jul 01, 2009 | Electronics - Others

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