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What are the brand, model and serial numbers of the genset?
Without knowing which genset you have, I can't even begin to tell you where to start.
The brand, model and serial number are very important - I can't even begin to guess what type of systems or components your genset has, to know what to do.
That would be like you going to auto parts store and telling them "I need a set of brakes for a pickup". They are not going to have a clue what to give you.