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Seat belt warning light: the one usually found in the 1966 has power supplied to it through a 4 amp fuse in the fuse block and a green wire. From the light, a wire, whose color is not identified in the wiring diagram, goes to a switch under the dash which extinguishes the light. This switch turns off the light after approx 10 seconds after the ignition switch is turned on. This "delay off switch" is located close to the LH end of the trim panel which includes the ignition switch. It is held in place with one screw. The second wire on the "delay off switch" supplies ignition current from the ignition to keep the light off.
How it works: the "delay off switch" is in the ground circuit for the warning light. When the circuit is energized by turning on the ignition, a bi-metalis element in the switch heat up. This causes the contacts to open and the circuit to ground interrupted, thereby providing no completion of the light circuit.
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