Some easy diagnostic procedures include checking a battery or fuse. Both of these components requires the use of a special tool called a multimeter that checks their electrical current.
To check whether or not a battery has enough voltage to start a vehicle, set the multimeter to read DC voltage. Take the positive and negative prongs and place them on top of the battery terminals. If the number reads under 12.5v then the battery will require a charge to work. If it is under 12.06v then it is most likely dead and may require replacement.
Fuses are even simpler to examine. Take the multimeter and set it to read in ohms. If the fuse shows a resistance value than it is working. However, if it fails to move from its original number, then it requires replacement.