What can result from high resistance in electrical connections due to corrosion?

High resistance in electrical connections due to corrosion can lead to a voltage drop and eventual component failure. When connections become corroded, the conductive pathway is disrupted, leading to an increase in resistance. This higher resistance causes a drop in voltage as electrical current moves through the corroded connection, which can impair the performance of electrical components. Over time, if the resistance continues to increase, it can result in insufficient power reaching components such as the starter motor or electronic control units, ultimately leading to their failure or erratic behavior. This is a significant issue in automotive electrical systems, where reliable connections are essential for proper functionality.

In contrast, the other options do not accurately represent the consequences of high resistance in electrical connections. Improved vehicle efficiency, enhanced battery life, and better fuel economy are outcomes associated with optimized electrical systems, but these cannot occur if high resistance and resultant voltage drops are present.