How do turn signals work?
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Power on a traditional [[flash unit]] is delivered to the system via the flash unit. A fused, switched lead is run from the fuse buss to the flasher, so that it only receives power in the "Hot in Run" position. | Power on a traditional [[flash unit]] is delivered to the system via the flash unit. A fused, switched lead is run from the fuse buss to the flasher, so that it only receives power in the "Hot in Run" position. | ||
| − | From the flasher, a wire is run to the center wiper (or | + | From the flasher, a wire is run to the center wiper (or movable contact) of the turn signal switch inside the steering column. |
The flasher operates from internal heat on a tungsten bi-metallic "strip" that makes or breaks the contact at the switch side (or "power output" side) of the contact. The bi-metallic strip functions as it does by two dissimilar metals (Bi-metallic) with dissimilar expansion rates causing it to bend. | The flasher operates from internal heat on a tungsten bi-metallic "strip" that makes or breaks the contact at the switch side (or "power output" side) of the contact. The bi-metallic strip functions as it does by two dissimilar metals (Bi-metallic) with dissimilar expansion rates causing it to bend. | ||
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This switch is wired traditionally as such: | This switch is wired traditionally as such: | ||
| − | *The center wiper ( | + | *The center wiper (movable contact or cam contact) is lamp output. |
*The normally closed contact is brake lamp power from the [[brake lamp switch]]. | *The normally closed contact is brake lamp power from the [[brake lamp switch]]. | ||
*The normally open contact is power from the flash unit. | *The normally open contact is power from the flash unit. | ||
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