Flasher Can/Control
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FIGURE 36-39
Flasher control and flasher can.

The flasher can is the control mechanism for the turn signal lights on the vehicle. As the name suggests, it flashes or turns the turn signal lights on and off at a regular rate to indicate a change in the vehicle’s direction. Flasher cans are mechanical devices, while flasher controls are generally electronic devices Figure 36-39. Both types perform the same job, but the electronic version is more reliable and consistent. Flasher cans operate like an automatically resetting circuit breaker, meaning they use a bimetallic strip to open and close the switch contacts. This opening and closing gives them a distinctive clicking sound that, along with the turn signal indicator lights on the dash, tells the driver when the turn signals are on so that they remember turn them off when needed. Electronic flasher controls control the on/off function electronically, which means they can be designed to operate over a wider range of current flow, which makes them ideal for trailer towing. In many cases, the hazard lamps are also operated by a flasher can or flasher control.