This is a complicated problem. There are several ways of doing it, but the most important thing is to make sure that the unit is properly grounded, and that there is no possibility of back feeding the power lines. You must have a positive disconnect between your panel and the generator. This can be through an approved isolation switch or and approved transfer switch.
You also want to make sure you do not overload the generator
SOURCE: I have a Generac portable generator 5000 watts, won't start!
I am assuming the generator worked fine before the oil change. Now that you have done the oil change the genset does not start. These generators have a safety switch, which is basically an oil pressure switch that keeps the engine from running when there is not enough oil in the engine. Make sure that there is enough oil and if there is, look for a wire that runs along side of the engine to a round component. disconnect that wire and try starting. If it does not start then try to ground out the wire to the engine block. If this does not work, then there is other engine problems.
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