Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. I doubt it is a main fuse otherwise you would probably at least her a click...But fusible links are located near battery inline between the battery fuse stud and generator B terminal...If you dont even hear a click I would see if it starts in neutral....Red wire at ignition switch should have voltage if not then a fusible link could be blown but if good then not...If good voltage check yellow wire for voltage with key in start position..If no voltage on yellow but voltage on red replace ignition switch...If both are good access wires on transmission range switch both yellow and purple wires should have voltage while trying to start if only yellow replace transmission range switch. Let me know if you have questions, thanks.
Sounds good if you do above tests it will lead you to the problem and if you run into questions you can reply to this answer at any time even after you accept without any additional fee's so let me know how it goes. thanks.
Things to check are spark, compression, and fuel pressure..