Aftermarket Denso Voltage Regulator IN921

Specifications MFR:DENSO DIM 1:43mm Mtg. Length FEATURE 1:100% New NOTE 1:IN921 is similar to IN920 except: IN920: rectangular 3-terminal plug. IN921: round 3-terminal plug. SPECS FOR:Denso IR/EF Alternators SPECS:12 Volt, A-Circuit, S-L-IG Terminals, 14.0 Vset USED ON Hino (1984-1997) Replaces Denso 126000-0920, 126000-1421, 126000-1460, Hino 27700-1740, Isuzu 8943426800, Toyota 27700-64040, 27700-64110 LESTER NUMBERS 12214, 12215, 20513, 22320 UNIT NUMBERS Denso 100211-5950, 100213-0810, 100213-0811, 100213-0812, 100213-1120, 100213-1210, 100213-1420, 100213-1421, 100213-1450, 100213-1500, 100213-2560, 101211-6140, 121000-2750, 121000-2751, 121000-7750; Hino 27020-1290A, 27020-1810A, 27020-1811A, 27020-2130A, 27040-1290, 27040-1290A, 27040-1900A, 27040-1900R, 27040-1920A, 27050-1290A, 27050-1292, 27050-1292A, 27050-1292C; Isuzu 8-97940-220-0; Toyota 27020-64210, 27020-64211, 27020-64220, 27020-64221, 27040-64130, 27040-64131, 27040-64140, 27040-64141 Vehicle Application Toyota LCV - Europe Bus Coaster 1HD-T; 4.0L Dsl. 2003-2012 Coaster 1HZ; 4.0L Dsl. 1993-2012 Hino Medium/Heavy Truck FA14 L4 3.8L 3839cc 234cid Hino W04C-T 1989-1991 FA15 L4 3.8L 3839cc 234cid Hino W04C-TH 1992 FB15 L4 3.8L 3839cc 234cid Hino W04C-TH 1992 FA1415 L4 3.8L 3839cc 234cid Hino W04C-TH 1993-1994 FA1415 L4 3.8L 3839cc 234cid Hino W04C-TM 1995-1997 FB1715 L4 3.8L 3839cc 234cid Hino W04C-TH 1993-1994 FB1715 L4 3.8L 3839cc 234cid Hino W04C-TM 1995-1997 Features & Benefits Precision aftermarket replacement part Regulates alternator output voltage Helps maintain proper battery charging Supports stable charging system performance Manufactured to match original specifications Designed for dependable long-term operation Ideal for alternator rebuilding and repair Cross-referenced to OEM and aftermarket part numbers     What Does a Voltage Regulator Do? The voltage regulator controls the alternator's output by regulating current supplied to the rotor field winding. As electrical demand changes, the regulator continuously adjusts field current to maintain the proper charging voltage for the battery and the vehicle's electrical system. A properly functioning voltage regulator helps prevent battery overcharging and undercharging while protecting sensitive electrical components from excessive voltage. Because charging system performance depends on the interaction between the regulator, rotor, stator, rectifier, and battery, replacing a faulty regulator is an important step in restoring alternator performance.     Common Signs Replacement Is Needed Replace the voltage regulator if you notice: Battery overcharging Battery not charging Low charging voltage High charging voltage Battery warning light illuminated Intermittent charging problems Headlights that brighten or dim with engine speed Charging system failure during testing Voltage regulator failure discovered during alternator rebuilding     Installation Recommendations Installation should be performed by a qualified technician or experienced alternator rebuilder. Before installing the new regulator, inspect the brushes, brush holder, slip rings, rotor, stator, rectifier, wiring, and electrical connections for signs of wear or damage. Always verify connector configuration and mounting style before installation. After assembly, bench-test the alternator to confirm proper charging voltage and overall charging system performance.     While You're Rebuilding Inspect other common wear components to help maximize charging system reliability: Bearings Brushes Brush Holder Slip Rings Rectifier Diodes Rotor Clutch Pulley Insulators     Why Buy From RC Auto Electric? RC Auto Electric specializes in alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of OEM and aftermarket electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.     Disclaimer Compatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original part, connector configuration, mounting style, voltage specifications, cross-reference numbers, and product photographs before installation. If you are unsure about compatibility, contact RC Auto Electric before ordering.