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Which reason makes a bypass relay necessary on a modern tow vehicle?

  • A.The trailer lamps must be electrically isolated, which prevents interference with the data network of the vehicle
  • B.The vehicle monitors bulb current and would report faults
  • C.The trailer draws more current than the vehicle circuits can supply, which requires a separate supply to be provided
  • D.No reason

Answer: B

Bulb monitoring sees the additional load as a fault, and the relay module feeds the trailer from a separate supply. Current capacity genuinely is a factor too, which makes the second option a real part of the reasoning. The shared behaviour explains why these belong together and the differences explain why both exist. Checking which component actually carries the load settles most questions of this kind at once. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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