Wiring harness replacement

The power to the flasher follows quite a route. From the flasher, the black wire to the flasher (D1-18 BK) goes and junctions at terminal "B" of the interior bulkhead connector. This feeds out and feeds the backup light switch, and meanwhile, the interior side now changes to WHITE (B1-18W) I would check there for power.

Now the no 18 WHITE runs up and junctions with the RED wire at the radio connector, (X12-14R) Check there for power and a bad connection.

Now that no14 RED runs from the radio off to the HEATER blower connector where it again changes to BLACK (C1-14BK) and finally goes off to the fuse panel.