Brand New Voltage Regulator Alternator Charging System For 1988-1991 Ford and MercuryVoltage regulators control the charging voltage that the alternator outputs,generally keeping it between 13.5 and 14.5 V, to protect the electricalcomponents throughout the vehicle. When not replaced, the battery candischarge or over charge (causing battery damage), the engine will die, thecheck engine light will illuminate, or alternator damage may occur. AIPElectronics voltage regulators are designed to meet or exceed OEspecifications in form, fit and function to protect your electrical systems.Manufacturer: AIP Electronics100% New ConstructionHigh Quality OEM Replacement/OES PartFit and Quality GuaranteedReady for Install Straight out of the boxChannelSaleTech-specs88925139 E8PZ10316B VR416 1V1102 VR790 IM268