Battery is charged (and 5 months old) but no electric is working on 1990 Ford E-150

This is actually for a 1988 club wagon e-150 e-conoline. When I put the key in, no buzz alarm with door open, no lights come on, no starter turn when ignition is activated. 12.53 dcv across +,- on battery... Can anyone help? Is there a master fuse, fuselink, or circuit breaker that needs replaced? This happened at a gas station after putting gas in vehicle.

Asked by for the 1990 Ford E-150
check your ground wire to the electric(small wire) it happened to me