The fuel pump isn't turned on by the ignition switch. It's turned on by the Engine Computer only when the engine is rotating, (cranking or running).
It's easiest to find a switched circuit by checking on the fuses in the fuse box with a test light. You didn't say what you're trying to do. You have to consider how much current your project is going to draw and if the fuse and wires for the circuit you're tapping into can handle it. There's also the liability concerns. If something shorts in your project and puts 12 volts back on the feed circuit when it should be dead, that becomes something lawyers and insurance investigators get involved in. That's especially true of the fuel pump circuit. That circuit must never have voltage with a stalled engine because a fuel line ruptured in a crash could keep dumping raw fuel onto the ground, creating a major fire hazard.
No one here will help with altering suspension ride height, and I really hate rude and obnoxious audio systems, but other than that, I can offer plenty of suggestions for custom projects if you tell me what you're up to and what your skill level is.
Tuesday, January 27th, 2015 AT 9:07 PM