This unit is known as the "K5" relay in the service manual and is stamped with C7WB-13A366-B. The turn signal indicator relay switches the indicator light circuit so that the left indicator lamp on the instrument panel flashes for left turns and the right lamp flashes for right turns. Application is 1967 Mercury Cougar. No guarantee that replacing it with our used unit will actually make your dash lights consistently blink more than two or three times before going into a "pulsate mode" (if that is what you are experiencing now). This unit (and subsequent system) is an inherently weak design. Make sure your ground wires are clean and connected firmly and all your light sockets are clean. You may also consider going to a higher amperage alternator, some have even opted to convert to a Chevrolet alternator with an internal voltage regulator. Learn more at www.mercurycougar.net
*NOTE* Need help diagnosing a Cougar turn signal problem? Victor Yarberry is the world's most knowledgeable expert on the subject. Vic has owned Cougars since the 1970's and is the designer of all of our solid state sequential systems. There is no question he cannot answer! Here is a link to a great source of information on the subject.