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raykay · 22nd January 2021, 15:47

The right hand connector is connected to the relay contacts, which act as a two way switch. When the relay is off, the common terminal is connected to the normally closed terminal, when the relay is on, it is connected to the normally open terminal.
As Heddy has found, there were two types of FBH, one switched on by an earth connection to terminal 3 of the FBH, the other by a 12v connection. His just needs 12v to terminal 3 to turn the FBH on.

22nd January 2021, 15:47	#9
raykay I really should get out more....... Now Other Manufacturer Join Date: Nov 2006 Location: Co. Kerry Posts: 2,786 Thanks: 16 Thanked 310 Times in 283 Posts	The right hand connector is connected to the relay contacts, which act as a two way switch. When the relay is off, the common terminal is connected to the normally closed terminal, when the relay is on, it is connected to the normally open terminal. As Heddy has found, there were two types of FBH, one switched on by an earth connection to terminal 3 of the FBH, the other by a 12v connection. His just needs 12v to terminal 3 to turn the FBH on. Last edited by raykay; 22nd January 2021 at 16:05..