some air bags will hold a charge.. thaey have a capasiter in there brain box ,,, but it the charge will go away- after the bat is totally unpluged....give it 20min to an hour after should be good to go then man ... remeber bigger yellow wire is air bag wiring.. should be marked on harness/// i've worked with lots of them.. do auto body for a living..so i know what i'm talking about...