Ooh, I apologize this is a totally different design you are proposing.
I am not super savvy with this so I appreciate your patience.
This is what I found on that i believe serves the relay piece:
Amazon.com: New 5 Lot Car 30A 12V SPDT Relay & Socket Kit For Fan Fuel Pump Light Horn 5Pin: Camera & Photo
Essentially I go from
30 > 30A Fuse > Battery Positive
85 > Battery Negative OR grounded to car chassis?
86 > RAP Power (I am lost here, what wire am I tapping into for this? In the old design I was simply tapping into an existing RAP Fuse designated for something else)
87 > Tapping into - or + in device fuse?
Thanks so much for your help on this.