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My generator is an onan 4000... It was starting and running fine and then it wouldn't start anymore. It would try and try. Then I realized the ground wire going from the generator to the power converter box inside the cabin was hot and started melting/bubbling. A election buddy of mine looked at it and suggested that I change the wire from a 14-2 to a 12-2. I did and still the same issue. Tries to start but won't and the wire is getting super hot. Any ideas?

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It will not start because the generator is overloaded before it is even started. I suspect there is a short circuit in the power converter. Disconnect the converter and see if the engine will start then. If there is serious overload when you reconnect, you will know where the problem is. It will probably trip a breaker or blow a fuse then. If you narrow the problem to the converter, write back and I can help you with this too.

Robert

Posted on Nov 24, 2014

  • thomas mccauley Nov 25, 2014

    I actually just connected an extra ground wire from the generator straight to the frame of the rv and it started right up with no overheating of the wires.

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Posted on Jan 02, 2017

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mamicheddy
  • 79 Answers

SOURCE: Only runs if I hold the start switch

The problem is that you are not creating voltage. Remove front cover. Place a volt meter on the breaker. Start genset and you will see no voltage present. The problem could be with the brushes, rings, rotor, stator, voltage regulator, or control board.

Posted on May 09, 2009

  • 77 Answers

SOURCE: onan 4000 start good runs only ten minutsand shuts down,starts up

First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Posted on Aug 10, 2009

cmcduncand
  • 714 Answers

SOURCE: the onan generator will not start 4000 KY----looks

If it is clicking it may not be bad, Sight unseen. Your problem is a low battery.

R/
David

Posted on Jan 21, 2010

  • 332 Answers

SOURCE: I have a Onan 7000 genset in my rv It starts and

Either you have a kill wire ( if I remember it is the brown wire) that is disconnected on one end or the other Or your in coach switch is bad.
Check the switch this way

Remove the switch from the dash/ mounting surface unplug the brown wire - start the genset - ground the brown wire - it should kill the motor
If it kills the motor your switch is bad

Posted on Mar 07, 2010

SOURCE: Honda ems 4000 generator starts and runs great, but no power

At the controller, you need to see if it is actually sending electricity out of the Generator/Alternator, have a look where the leads from the power making unit mates, (Think of it as a motor in reverse) onto the board. There should be an AC Voltage there, then, work back, or out from there, trace the Voltage until it stops, thats the problem... Check the Breaker isn't tripped or faulty too.

Posted on Mar 22, 2010

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