Cold start assist power issue

Have a 2013 MF 11. Having problems locating the power source for the intake air heater fuel solenoid. Had code 5548-5, the solenoid is good. There is no power to the solenoid or the relay supplying it.Relay is new. It's wire K14A (8g) and i can/t find it in the fuse panel. Tracing it is a pain as it goes into a large wiring harness.along the engine block that takes off everywhere. Could it get power from the body controller? A wiring diagram I have shows battery power supply with a fuse/breaker symbol but no location and no body controller. Hope this is a simple find! Thanks for any help.

 

Thanks Headyd. Is the new feed hot all the time, like directly from the battery?

 

Thanks-I found a source on the firewall-just making sure it’s hot all the time.