After backing under a trailer, the fifth wheel's locking indicator does not show that the jaws are fully closed around the kingpin. What should you do?
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Correct!
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Correct answer to question 39 (Combination Vehicles): Back under again and recheck the coupling before doing anything else
Why
An indicator showing the jaws aren't fully closed means the coupling may not actually be secure, so the right move is to redo the backing and coupling, not to work around it with chains or a feel test.
Updated: November 2026
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