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See this members personal page.
He shows both types of panels, new and ole style.

The old style has push/pull switch and fuses for the lights, etc.

The new style has rocker switches and circuit breakers for the lights, etc.

Which style do you have?
Check the fuse by the Nav Light switch first.

After that, a test light is a must to check for power at the incoming side of the switch and then to make sure you have power when it leaves the switch once it is turned on.

It is very simple and many people try to make it complicated.
So, lets keep it simple.
Power before the switch and power after the switch is where we want to start.

1. Power on the incoming side of the switch tells us we are connected to a good battery and the fuse is good.
If no power coming in, then the wire is broken or disconnected and/or the fuse is blown.

2. Power on the outgoing side of the switch tells us the switch is good when the switch is pulled.
If not, then the switch is bad.

3. Continue on from there to the light bulbs and test those along with the wires to the bulbs.
If you are getting power to the light socket, then you know both the ground wire and the positive wire are good.
If you are not getting power to the bulbs, then you most likely have a broken wire(s) from the switch to the bulb/socket.
You would need to trace it down or replace the bad wires.