help adding relay to auxiliary relay box

[Raptor Hawkeye]

I'm installing a Hornblaster/Viair air system and want to utilize a empty relay spot in the auxiliary box to switch the air solenoid for horns using a horn signal and upfitter power, the same way as this guy in the link does it at 6:40 but with the relay plugged into the auxiliary relay box. Onboard Air & Train Horn Ford Super Duty F350 - YouTube

If you guys could help me with the wiring through the box, I would appreciate it.
Thanks

 

[Yukon Joe]

I was not able to figure out how to wire the horn, relay and upfitter switch all together. Therefore, I didn't use the horn. My aux two is the train horn switch.
Good luck. If you find a solution, please share.

Yukon Joe
www.RUNRAPTORRUN.com

 

[The Car Stereo Company]

not quite sure what you are trying to do. a little more detail, and i will see if i can help out