I've just bought a 2000 super with lock actuator problems. They did work, but suddenly all of them stopped moving the lock mechanism far enough. The solenoids are twitching, but not moving far enough. Is this a lack of voltage to the solenoids, or sheer luck that they all four failed at the same time? These Fords are new to me. Will I have to replace all these solenoids? It's the same either with the remote, or the door switches. The previous owner recommended this forum, so let's see what you guys can tell me. Thanks.