You're just going to have to go through your wiring and check some things out. Start with the obvious. Battery, ignition switch, starter, etc. and go from there. A haynes manual has a good enough diagram to show you where to go next, if not, then the fsm's are available somewhere on here if you search them out. The EL section is what you want. You should be able to find the problem with an ohm meter and a test light.
Just to add...I have had problems with the anti-theft circuit before and it caused a problem like this.