Hi. Yes you should have 27VDC at the brown-orange wire. This is coming from the red wire through the relay coil,and the 27VDC should be present all the way to the driving transistor.
Since you don't see the 27VDC on this side of the relay, you have a problem right at the relay board. Could be an open coil, broken through hole lead under the relay for the relay coil, broken through hole pin on two pin connector for the relay coil, burned or open trace, or failed wire crimp connector. Removing the board and examining with an ohmmeter should quickly identify the fault.