In mine if you flip the switch on the driver side the passenger side heating element goes on, and vice versa. Yet another Morgan feature !
Need to reverse the switches or connectors there.
Once after having my Beemer serviced, the tech had reversed the leads on my turn signals. Didn't notice it until I was half way home and doing highway speeds. Could have cost me my life even though I always hand signal as well. Guess your situ isn't as critical.