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Is this an Onan diesel generator? Can you give me the whole model number off the data plate please?
I don't have any information on Catapiller generators. I will opt out of this question and allow another tech to offer something.
Hello, my name is ***** ***** I am going to assist you with this.
The most likely cause of your issue is that the genset is no longer producing any power.
Connect a voltmeter to the output leads of the genset, and press and hold the start button to keep the engine running for a few seconds.
How much voltage do you see?
Inside the control box, there are 3 relays.
One of them will have a jumper wire between pins 30 and 85.
Test this wire while cranking the genset.
Do you have 12V to this wire while cranking?
Yes, the control box is where the start switch is located.