Fords will do that when there's no charge from the alternator- they quit on you pretty fast too. A fuse blows to the alternator, ya walkin', an accessory belt breaks, same thing,
He may be referring to a ballast resistor, but that wouldn't affect charging or the battery except you'd keep starting the car and it would die as soon as you let go of the key, and you'd run the battery down trying so many times. Fix that fuse, make sure the alternator is charging the battery and make sure the belt that drives the alternator is tight enough and isn't missing altogether. If you don't find the alternator fuse ( it might be a 5 amp ) in the regular fuse box, search way under the dash where the $100 and hour guy will go at the dealer to fix it- and probably sell you a new alternator too.