After disconnecting the electrical cable from the trailer during uncoupling, how should the driver hang it on the tractor?
Combination Vehicles • Free CDL Practice Question
Regulation
AAMVA CDL Manual, Section 6.4.2 "Uncoupling Tractor-Semitrailers," Step 5, p. 6-9
Why This Matters
A corroded or moisture-damaged electrical connector can cause trailer lights or ABS signals to fail on the road, both a safety hazard and a potential roadside inspection violation. A simple habit like hanging the plug downward protects the connection between uses.