1967 Thunderbird Turn signal switch connections For more information, review the Turn Signal Switch Diagnosis Guide. Make sure they are all securely seated into the connector and the connector is not melted or burned. The turn signal switch connector pins can also be burnt or oxidized: carefully inspect the pins on both sides of the connector. This can only be seen with the steering wheel removed. Usually the switch has failed when the plastic around the riveted contacts in the area around the emergency button appears to be burnt or melted. If any connections are open, replace the switch. The table shows wire pairs that should be shorted together with the switch in the indicated position. Disconnect the turn signal switch from the harness and check it according to Table 1 using a VOM or self powered test light. Next try depressing the emergency switch, if the emergency flashers work, the turn signal switch is most likely bad. If there is no sound, check for power at the directional relay in the trunk for 12V on the white wire (LH turn) and purple wire (RH turn). Lack of power indicates either a failed turn signal switch or fuse. Start by checking for 12V power on the orange/green wire feeding the motor-driven sequencer in the trunk. A click from the directional relay in the trunk may be heard. When the turn signal lever is depressed, no lights come on anywhere. If these are all good, then now the real sleuthing must begin! 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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