What factors should be checked for electrical wires during a pre-trip inspection?

During a pre-trip inspection, it's essential to ensure that electrical wires are in good condition for safe vehicle operation. The correct choice emphasizes checking for secure connections and the absence of frayed wires. Secure connections are vital as loose or poorly connected wires can lead to electrical failures, which may cause critical systems in the vehicle to malfunction. Also, frayed wires pose a significant risk as they can short circuit, leading to potential fires or failures in electrical systems.

While visible cuts and frays, presence of corrosion, and heat resistance are important factors to consider, the primary focus should be on ensuring that the connections are tight and that the insulation around the wires is intact or undamaged. This guarantees that the electrical systems will operate safely and effectively during the trip.