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Good job.   It almost had to be something like that.  Looking at the schematic the TX switch on the mic goes to pin 3, pin 3 goes to the CB/PA/MON switch and, assuming the switch is in CB position.... goes straight to the trigger side of the relay.


The hot side of the relay goes straight to the power switch and, if the radio has power, then the relay coil is hot....   not much else to go wrong.


Glad you found it.