Generator and Electricity Issue

The exciter current is only applied when the start button is pushed. When cold you probably have to hold it longer to start and the current has a chance to build the field for power generation. When warm the engine starts quickly, you release the button, and there hasn't been a long enough current for the field to build so no power. Pushing the button again gives it the additional current to build the field. Generac has a kit consisting of a diode, resistor and associated wiring that can be installed to provide a constant exciter current regardless of how long the start button is pushed. I installed one in mine and have not had an issue since with power coming up.

Here's where I bought mine and also a link that has a link to PDF instructions:
http://www.apelectric.com/0H07850SRV-Generac-Guardian-field-boost-uplift-k-p/0h07850srv.htm
http://www.zillerelectric.com/forums/showthread.php?t=1378