Flasher units are being discussed. Technician A says that a DOT (Department of Transportation) approved flasher unit should be used for turn signals. Technician B says that a parallel (variable-load) flasher will function for turn signal usage, although it will not warn the driver if a bulb burns out. Who is right?
a. Technician A onlyb. Technician B onlyc. Both Technicians A and Bd. Neither Technician A nor B

C. Both Technicians A and B.

Explanation:

The DOT flashers are a turn signal flasher unit. It is installed in a metal chip attached to the dash panel. The hazard and turn signal lights found on the vast majority of road going vehicles are controlled by a flasher, which is commonly referred to as a relay. The flasher is an electrical component that serves as the switch that allows the lights to flash on and off. Normally when a LED bulb in a variable load flasher unit is out the flasher cycles faster because of the increased current flow (they use less current than normal bulbs) through the bimetal strip in the flasher unit (note: resistors in parallel have a total current as the summation of individual current passing through a resistor)

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