Just finished replacing the blower motor and heater core on my '79 264. Everything is working great except for the brake lights. Tail lights and rear turn signals work fine. Everything electrical disconnected from center dash and speedo console labeled prior to disassembly and reconnected in reverse order. Even took pictures to document the procedure and pass along to my son.

Brakes work fine. Brake lights are not energizing, tested with tester. Everything worked correctly before.

Question: The brake sensor on the brake pedal arm has two points of connection, with one point having two spade connector ends. Two wires connect to sensor, one on each point of connection with one of the spade connectors on the double point left empty. Am I missing a ground wire here? My manual doesn't indicate three wires, just two. Also, when applying the brakes, the bulb sensor relay buzzes slightly. Have checked, even replaced, the double filament brake bulbs to no avail. Advice!?