Are your headlights and tail lights hooked into your alarm system (the flash when arming and disarming). You may have used a wire that was part of the alarm system. Does your alarm system kill the ignition so the van cannot be started? Could have done something to destroy the alarm system.
Might want to start by going backwards. Take the stereo out and putting any wiring back to the way it was before until things go back to normal. If that does not work then take the alarm out and repair any wires that have been cut and spliced for it.
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