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Which check confirms the trailer lights are working correctly after hookup?
- A.If the tractor lights work, the trailer lights are assumed good
- B.Trailer lights only need checking after dark
- C.One flash of the four-ways in the yard proves every lamp works
- D.Turn on each function (markers, brake lights, turn signals, four-ways) and walk around or use a helper/mirror check to verify them on the trailer
Correct answer
D. Turn on each function (markers, brake lights, turn signals, four-ways) and walk around or use a helper/mirror check to verify them on the trailer
Why
Burned-out brake or signal lamps on the trailer are exactly the warnings following drivers depend on. Each function has to be exercised and seen working on the trailer itself.
Manual topic: Combination Vehicles - Trailer Inspection · From the Combination Vehicles practice bank (CV-173).