What should you do with the electrical cord when coupling trailers in a doubles or triples combination?
a.Leave it disconnected until needed
b.Ensure it is firmly seated in the socket and secured
c.Tape it loosely to the air lines
d.Connect it only if the trailer has lights
Explanation
Electrical cords must be firmly seated in their sockets to ensure proper function of trailer lights, turn signals, and brake lights. Loose connections can cause intermittent light failures, which are hazardous and illegal.