No Power in the car, but there is in the engine bay

Actually I didn't intend for the OP to jump into a bypass project. What was in my head is the simplified diagram that shows how the main power is distributed. If you have "no power" it is almost always related to battery connections/ cables, the fuse link, bulkhead connector, or ammeter connections. "In rare cases" ------hey it's happened-------the "welded splice"

This is the simplified diagram of the FACTORY wiring

amp-ga18-jpg.jpg

Follow along the "functional path" NOT "electron flow." From the battery, depending on year, the power "arrives" at the big stud on the STARTER RELAY.........From there through the FUSE LINK........through the BULKHEAD (RED) and to the AMMETER.........through the ammeter and out on the BLACK ammeter wire and to the WELDED SPLICE. (This splice is a few inches from the ammeter up under the dash)...............

From there things branch off various years / models......

to HEADLIGHT SWITCH
to FUSE PANEL HOT BUSS
to IGNITION SWITCH