Overview Replaces voltage regulators on twin Cessnas, Beechcraft, and Vulcanair. ( Refer to Model Eligibility for your more information and additional models)The Plane Power R1224B Voltage Regulator is a solid-state voltage regulator with over-voltage protection, field short (over current) protection, and reverse battery protection. The Plane Power R1224B Voltage Regulator also supports precision load sharing for twin applications, and an alternator inoperative lamp. The R1224B voltage regulator is designed to be setup in the field for 14 or 28 volt operation by configuring the two jumpers within the voltage regulator. Attention:Some applications require accessory part number 07-03532. See Application Guide for requirements.