Diesel Generator

http://en.wikipedia.org/wiki/Electrical_generator

Just go to Google.com and search your information.... if you had any doubt come back.....

basic principle eh?? ok.. first, you need to have your fuel necessary for your engine to start(obviously) second, you need to have a field excitation. this is done by applying dc voltage and current to your field armature... third, make sure you have made enough excitation by running it idle for few minutes... connect load when excitation is enough, this way your generator could operate smoothly..