Final answer:
AC Ripple in vehicle electrical systems should be kept low to prevent electrical interference and wear, with a standard acceptable level typically being around 100 millivolts or less, depending on the vehicle's specifications.
Step-by-step explanation:
The student's question about the maximum allowable AC Ripple in vehicles deals with the concept of electrical noise in an automotive electrical system, specifically related to the alternator's output. In this context, AC Ripple refers to the alternating current (AC) component that can be found superimposed on the direct current (DC) voltage output. High levels of AC Ripple can cause issues such as electrical interference or premature wear of electrical components. While the provided reference materials don't give an exact figure for vehicles, a standard acceptable level of AC Ripple is typically around 100 millivolts (0.1 volts) or less. However, specifications can vary between different makes and models of vehicles, and the user manual or technical specifications should be consulted for precise limits.