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1973 Series III here. Hoping for some troubleshooting suggestions. for no apparent reason my blinkers and break lights both stopped working mid-drive yesterday. When I move the blinker switch, the interior green arrows do not light up and the blinkers outside do not work. And no break lights now either. When I put the Hazards on, the interior green blinker lights both work and the blinker lights in the back both flash like they should. Where do I begin?? Thanks for your help!
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Check the fuses and fuse holders as the power for the turn signals and brake lights are both supplied by the "Green'" wire circuit, which is fused "ignition ON" power. A white wire from the ignition circuit supplies the incoming power to two of the fuses, and green wires exit to power various loads. The fuse box terminals use riveted connections that can can corrode or loosen causing loss of power.
Assuming the wiring on your truck is not modified, the hazard circuit on an SIII usually uses a different flasher than the turn signals and has a different 'always hot' power supply. The turn signals are powered from the fused 'ignition ON' green wire circuit off of the fuse box. Power from the fuse box goes to the two prong flasher and then to the turn signal switch. The turn signal switch routes the power from the flasher to either side when selected.
Depending on the hazard switch, the switch can have the green wire power for the turn signal flasher routed thru the hazard switch. With the hazard switch OFF, the green circuit contacts in the hazard switch are closed routing the power to the turn signal flasher. With the hazard switch ON the green contacts open isolating the power to the turn signal flasher.
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