Now I am thinking of just running the relay bus to the high side through one of the extra fuses, that way the EFI box can control the relay low sides for fans and A/C clutch, and I'll just do the Headlights with regular relay setup.
I am looking at running two puller cooling fans and and additional pusher fan for the A/C condenser. So with the A/C clutch too, 4 of the 5 relays are being used. I guess I could also use the fifth relay to replace the horn relay? Just trying to clean up the engine compartment wiring.
I may use some of the fused constant power circuits for the radio head unit constant power and the amplifier power?
Not sure what else to use the extra constant power fuses for (under hood?)

Interior wiring and EFI changes still in the works.