BAC/Idle valve wiring?
 

When i ordered my LT9 months ago i got it with the bac/idle option but since then i have been running my bridgeport so i never needed it.Now i am gonna run just a streetport and i will like 2 use the bac option but the manual is not very clear about the wiring.It does show 2 connect one wire the aux 1 output but nothing about the second wire on the valve.Will the other wire go 2 ground?a 12v source?battery?
Please help me out guys.......thanks

a switch 12v

Thanks turbonitroso!