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I have a 94 F150 5.0 with the e4od. Today I lost all electrical power to the vehicle. Battery is good 12.6 volts. No lights in the cab no headlights no radio no ignition no wipers no nothing.
Battery cables and grounds good and still connected tightly?
Sure doesn't sound like it. Classic symptom of a failed battery (under load!), bad battery cable, or bad connection of a battery cable (either end of either cable).
This should be an easy one, though it might not seem like it at first.
Measure battery voltage when it's loaded down, it isn't unusual for open circuit voltage to read OK, though choke when an actual load is applied. If the voltage is unchanged then look for a defective major battery terminal connection, something like that.