The dimmer switch has three "terminals". A terminal block is an insulated phenolic board with three screws normally mounted to INNER fender.
This is where the screwup is probably. Someone bypassed the terminal board which is a good thing to get rid of unnecessary terminations, but it's where the screwup is. inside the tape.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn