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Old 05-08-2015, 12:53 PM   #1
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Onan gen won't start

Ok had it running fine last month in Fl Now it won't start. Checked oil level, fine. Checked ground and reds, sanded both to clean, appeared ok but did it anyway now they are fine.

dash button no go start at genny does not move starter. I get sort of a mild noise, not a click but something there. Power is getting to the genny. Plenty of gas but that would not be it because starter does not work.

Any ideas before i bring it to a shop?
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Old 05-08-2015, 02:12 PM   #2
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Is it gas or diesel. Are you priming it before trying to start it.
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Old 05-08-2015, 02:23 PM   #3
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When you say won't start does that mean it is turning over and won't start or you get nothing at all no turn over.


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Old 05-08-2015, 02:26 PM   #4
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That's a simple enough circuit to poke around in, edsperfect. If the solenoid doesn't give a satisfying clack when you push the start button it's a pretty safe guess that you don't have good power and ground connections. If "something" is happening as you say you can either touch each connection while to try the starter button -- ans see if your skin sticks or use a voltmeter to measure the voltage across the connection. In this case no voltage is good a good connection, any voltage measured across the connection is bad and you need to clean the connection.

Try not to make the problem any more complicated than it really is.
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Old 05-08-2015, 02:30 PM   #5
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Start with checking battery voltages.
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Old 05-08-2015, 02:50 PM   #6
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no does not turn over
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Old 05-08-2015, 02:52 PM   #7
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battery voltage is fine
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Old 05-08-2015, 03:22 PM   #8
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no voltage across the hot and ground. Hit the start button on the unit, at the unit, and i get a soft clicking for about 5-8 seconds. NO cranking, the clicking is not loud as when a battery is dead or dying. just a soft clicking
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Old 05-08-2015, 03:23 PM   #9
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I am wondering if it could be the selenoid
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Old 05-08-2015, 06:49 PM   #10
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Could that be the fuel pump priming the generator?


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Old 05-08-2015, 06:59 PM   #11
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Solenoid is a simple system. You have 2 big wires and 2 small ones. The small ones control the pulling action so the main battery can goto the starter. Do like the first person said and check for voltage. In start mode you should read around 12 volts on both big wires. To check the starter is a simple trick connect jumper pack to the starter side or relay. But remember you must have 12 volts on one side of the relay at all times.


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Old 05-08-2015, 07:07 PM   #12
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Quote:
Originally Posted by edsperfect View Post
no voltage across the hot and ground. Hit the start button on the unit, at the unit, and i get a soft clicking for about 5-8 seconds. NO cranking, the clicking is not loud as when a battery is dead or dying. just a soft clicking

Where are you reading voltage in this test?
I think the earlier suggestion was to read voltage across either the switch contact, or the starter solenoid contacts.

Either one is normally an open contact that requires something to cause it to clise( your finger for the switch, or electricity for the solenoid).

When open, you should read voltage ( probably about 13.? Volts).

When closed, good contacts will gave very little resistance (low resistance can also be measured as voltage drop). You should read very little voltage across the contacts when closed.

In addition to previous recommendations, monitoring your battery voltage while trying to start, as well as measuring somewhere close to the starter can rule out bad wires and possibly bad grounds.

Good luck, let us know what you find!
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Old 05-08-2015, 07:21 PM   #13
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Use this troubleshooting guide, and it will take you step by step through the process.
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