[n9cv]

There is a mega fuse (100 amp) that sits next to the fuse panel. It is on the engine side of the fuse panel. It says 100 on it and has 2 vertical studs sticking out of it with nuts on them. Measure the voltage from each vertical stud to ground. When testing do not use the battery as your negative meter connection. Use some bolt head on the engine or the body. (I'm testing to see if your battery ground connections are also good.) There should be 12 volts there at all times.

If there isn't 12 volts, then you need to work backwards toward the battery. Move the negative meter lead to the battery and try again. If it is still no good then you have a problem with positive battery cable connection.

If there is 12 volts in the first test then you need to move forward and choose one item that does not work and trouble shoot it. Maybe the headlights. Shoot that problem.

BTW, Does anything electrical work?

This really sounds like a blown mega fuse or a bad battery cable connection. You should be able to find it quickly with your meter.