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By twisting together the speaker lines (from 14,15,16,17 & 30) AND the power wire.
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If you twist the wires together, the air-ride will not function correctly. Every time the computer tries to lift or lower the front or rear, all 4 solenoids and the vent solenoid will open, slamming the car.
What i did:
http://www.lincolnsclub.org/users/sleeper/solenoid_mod_1.3.jpg
It's fairly simple, really. Start by getting a piece of ABS and cutting it to fit where your cellphone goes. Then drill holes and install 5 switches on the plate, being sure that they're far enough from the edges of the plastic so that the plastic fits. Then sit down with a soldering iron and solder leads onto all the switches. There are a lot of ways to hook it up, the method above was the best for me. If you don't want to be able to raise it manually, don't care about the error message on the dash, and don't want to get diodes, then you may want something more basic. This is about as basic as i can make it:
http://www.lincolnsclub.org/users/sleeper/basic_solenoid_mod.jpg
For power, i used the wire going to the cigarette ligher. It is already fused, and it's right there in the center console. If you want to hook it up so you can raise it too (highly recommended), then tap into the ground for the cigarette lighter too, and hook up another switch (preferably a momentary switch - a switch that goes back to off as soon as you let go) to ground and to pin 18. When you press that button the compressor will activate.
The switches on pins 14, 15, 16, and 17 are for the solenoids at the wheels. Each one controls one wheel. To raise or lower the car, open the wheel solenoids, and press the "up" or "down" button (wired to pins 18 and 30, respectively) to achieve the desired ride height. I recommend you only do two wheels at a time. If you open all 4 solenoids, the weight on the front of the car will force the air in the front bags into the rear bags, and the front will slam while the back goes way up.
If you hook it up this way, when your hands are off the switches, your air-ride will function normally. When you start playing with it, you'll get an error message, which shuts the computer off and lets you do what you want. If you shut the car off and want to slam it, you'll have to turn the computer off in the trunk to keep it from trying to lift it back up. Also, when you slam it, stop letting the air out as soon as the car stops going down, or else it'll take a lot longer to lift it back up. If you're lifting it manually, don't let the compressor run for more than about a minute and a half. you don't want to overheat it.
And Jeremi, you get under there with a soldering iron and then tell me not to use t-taps.
I'm using the taps (something slightly different, actually), and i haven't had a problem yet. They work great. I'd definitely solder the wires on the switches, but it's just not feasible to solder the wires into the harness for the computer.
