Skoolie minibus chevyexpress2010

[Manzy Bébé]

Hi everyone, just bought a Chevrolet express 2010 mini bus to Do a 4 seasons home. When i got IT the right rear flasher and the rear light didnt work. I tested the wires with a test light ans Found out that There is no current passing on the wire. I have the plan of Electric but Still have a hard Time to figure out what is what. Can somebody help me with that problem??? I put pictures of the bus and the wires that are Cut of the panel.

[Jolly Roger bus 223]

my wifes 2004 express the fuses for lights turn signal brakes are in the underhood fuse box.
there is another fuse box under the seat.