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Which consequence follows from fitting diode indicator bulbs to an older vehicle?

  • A.Failure of the flasher unit, which is unable to operate at all with the very low current drawn by such a bulb
  • B.Hyper flashing unless a load resistor is fitted
  • C.Slower flashing, which follows from the reduced current drawn by the diode assembly that has been fitted
  • D.No change

Answer: B

The unit reads the low current as a failed bulb and speeds up, so a resistor or an electronic flasher is fitted. Some units genuinely fail to operate at all, which makes the last option a real outcome with certain flashers. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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