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I am looking at the electrical schematic diagram. It shows what appears to be a fusible link, labeled AM1, connected to the ignition switch through a white wire. It appears that would cause your problem. To check, see if you have 12V on the white wire to the switch connector.
What confuses me is that the other devices using the same symbol are labeled "FL." I am not sure what "AM" stands for. Somewhere in the harness is a circuit breaker, though I have not found it in the schematic. In my experience "AM" is not a circuit breaker, but who knows what Toyota had in mind? Maybe that is the circuit breaker and it needs reset. Apparently it plugs into the same assembly as the turn signal flasher and the taillight relay, on the left side of the truck, behind or under the dash.
Good luck.
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