Final answer:
Failing to install a memory saver before disconnecting a car battery typically results in the loss of electronic presets like radio settings since the power that maintains these settings is interrupted.
Step-by-step explanation:
If you fail to install a memory saver before disconnecting the car battery, you will not short out the battery, nor will you be unable to restart the car, and the fuses will not blow. What will likely happen is option (D): One will lose the radio settings and possibly other electronic presets like clock settings, seat positions, and in some cases, driving characteristics that the car's computer has learned over time.
The role of a memory saver is primarily to provide enough power to keep these settings intact while the main battery is disconnected. Unlike a short circuit where a wire directly across the two terminals of a battery can cause the battery to get hot, removing the battery without a memory saver does not create a short but rather interrupts the power supply that allows the car to remember these settings.
When car lights dim, instead of blinking off immediately when the battery is depleted, this is because the battery output voltage decreases as the power drains. Lights connected in parallel could also dim due to an overload diminishing the output voltage. This concept, while related to electrical systems, does not directly answer the question about failing to install a memory saver.