Walker Products 921-2080 Ignition Coil Designed for the professional technician and meet or exceed OEM manufacturers specifications The primary winding of the ignition coil is wound with a small number of turns and has a small resistance, applying the battery to this coil causes a sizable DC current to flow Manufactured to meet or exceed OEM standards and specifications Modern coil designs produce voltage pulses up in the neighborhood of 40,000 volts from the interruption of the 12-volt power supplied by the battery Some modern engines have multiple ignition coils mounted directly on the sparkplugs and instead of single voltage pulses, they may under some engine conditions produce three voltage pulses