Great thanks, looking forward to putting it together, bought the wrong (normally open) relays, minor delay.

 

bought the wrong (normally open) relays,

You mean SPST instead of SPDT?

 

This is what I bought
https://autobarn.com.au/ab/Autobarn...-Relay-(Blister-Pack-of-1)--68024BL/p/EL03112

I assumed all 5 pin relays would do the job. Obviously not.
I think this one will do the job.

https://autobarn.com.au/ab/Autobarn...elay-w-Diode-(Blister-Pk1)--68048BL/p/EL08128