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What does the bulb say on it? The wattage and volts should be on there. they do make 12 VDC bulbs that look like the regular household bulbs. They are still available. Does this have a 30 amp or a 50 amp shore cord? That might be the problem. Get back to me with this info and I can assist you further. All follow ups are included in our fee.
There is really no good reason other than if this has a 50 amp shore cord and you have a 30 amp adapter on the cord for this to work on shore power and not on the genset. OR the genset isn't working properly. OR it has the wrong adapter for your cord. Pretty much has to be one of those.
No reason it shouldn't work then........