If you wouldn't mind I would like to see your relay pic as well
I was about to do another drawing when I realised that I would do pretty much exactly what is shown in the bottom diagram in the page Grumpy pointed to.
In this case the "load" is the relay coil and the "extra component" I mentioned is the diode across the coil.
If you do that then the NC/C/NO contacts of the relay are isolated from everything and can be used to switch whatever you like up to the rating of the relay.
I appreciate the diagram on the link doesn't show how to hook up the relay contacts though so I'm still happy to do another drawing to show this if you need it as they may or may not be connected to your 12v.
Rob