I have a 92 deville with no brake lights.Pulled the brake light switch and it works fine. The bulbs are all good. I tested the four wire plug that goes tothe switch and there was NO power to any of the wires at any time. The cruise also doesn't work. Everything that goes to the engine compartment is pluged and looks fine.I tested all of the relays and fuse they are all fine. Please give your ideas. just don't say check the battery or the radio or something that doesn't make sense. The car works great except for this problem. Please let me know what direction to go next. Thanksfor your help