1996 Ford Probe wont start, no power at all

From what you tell us, it sounds like you may be having trouble with your charging system. Have your battery load tested and check the alternator output for voltage and amperage. You also may have a drain on the battery that, overnight, would result in a dead battery. Here is the procedure we use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior light