67 thunderbird taillight8/18/2023 ![]() ![]() The next stop is to check all bulbs and their sockets. The first place to check is the in-line fuse under the dash to the right the steering column. ![]() The most common complaints are: no turn signals, one or more lights on but not flashing, one or more lights flashing, and center and front lights only flashing. You will need a VOM (Volt-Ohm-Meter) and the circuit diagram for your year car. ![]() Now that you understand a little about how your turn signal system works, you can start troubleshooting. But when the turn signal switch is actuated, the brake light power feed is disconnected and the turn signal feed is activated to allow the directional signal to override the brake lights. Since brake lights are not sequenced, the directional relay allows all lights to turn on simultaneously when the brake light power feed is energized. This two-sectioned (right and left) relay routes power through to the selected bank of lights. The power is then routed to the directional relay. The sequencer has three cams that, when rotated, depress switches corresponding to the inboard, center, and outboard tail lights. Power for the lights is fed through the turn signal relay to the sequencer. Circuit diagrams may be found in the appropriate year factory shop manual.īasically, the system works as follows: when the directional lever on the turn signal switch is moved, it completes circuits that select and feed power to the corresponding bank of lights. The most failure-prone parts are the mechanical sequential flasher, the turn signal switch, and the stop lamp relay. The turn signal system has a number of electro-mechanical parts: the turn signal switch, (located in the steering column), a turn signal relay (located under the dash), two warning indicator relays (located behind the seat), a directional relay, stop lamp relay (on early cars) and a motor-driven sequential flasher located in the trunk on the driver's side high up in the fender. This article covers troubleshooting 1967 Ford Thunderbird sequential turn signals. ![]()
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