On the other hand, a consistently
low battery charge might be the result of a defective regulator,
alternator, or some other part in the electrical system. Sometimes a weak battery is due to a weak
alternator or a parasitic drain on the system.
Low voltage can also be
caused by
poor connections to the battery.
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In electrical engineering, low voltage is a relative term, the definition varying by context. Different definitions are used in electric power transmission and distribution, and electrical safety codes define "low voltage" circuits that are exempt from the protection required at higher voltages.