Need wiring diagram to wire in 24v transformer I have gas furnace and a regular condensing unit not a heat pump. Fan relay side is 120 v . Had old style fan relay which is no longer available was sold new trans with plug in fan relay. Wall thermo cycles condensing unit but blower fan in furnace will not shut off even when wall thermo is cut to off position:

Is this relay and transformer mounted on a steel plate and has multiple wires coming out the back ?

Yes