{"product_id":"oem-alternator-voltage-regulator-ib5219","title":"OEM Bosch Voltage Regulator IB521","description":"\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMFR: BOSCH\u003c\/li\u003e\n  \u003cli\u003eFEATURE 1: 100% New\u003c\/li\u003e\n  \u003cli\u003eNOTE 1: BSS\u003c\/li\u003e\n  \u003cli\u003eSPECS FOR: Bosch IR\/IF\u003c\/li\u003e\n  \u003cli\u003eSPECS: 12 Volt\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUsed On\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eBMW (2003-2006)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eReplaces\u003c\/h2\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eBMW:\u003c\/strong\u003e 12 31 7 515 319\u003cbr\u003e\n  \u003cstrong\u003eBosch:\u003c\/strong\u003e F 00M 145 280, F 00M 145 679, F 00M A45 219\n\u003c\/p\u003e\n\n\u003ch2\u003eLester Numbers\u003c\/h2\u003e\n\n\u003cp\u003e13986\u003c\/p\u003e\n\n\u003ch2\u003eUnit Numbers\u003c\/h2\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eAudi, Volkswagen:\u003c\/strong\u003e 059-903-015Q\u003cbr\u003e\n  \u003cstrong\u003eBMW:\u003c\/strong\u003e 12-31-7-519-618, 12-31-7-519-620\u003cbr\u003e\n  \u003cstrong\u003eBosch:\u003c\/strong\u003e 0 124 515 105, 0 124 625 026\n\u003c\/p\u003e\n\n\u003ch2\u003eVehicle Application\u003c\/h2\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eBMW Car\u003c\/strong\u003e\u003cbr\u003e\n  325Ci L6 2.5L 2494cc 152cid 2001-2006\u003cbr\u003e\n  325i L6 2.5L 2494cc 152cid 2004-2005\u003cbr\u003e\n  325xi L6 2.5L 2494cc 152cid 2004-2005\u003cbr\u003e\n  330Ci L6 3.0L 2979cc 2001-2006\u003cbr\u003e\n  330i L6 3.0L 2979cc 2004-2005\u003cbr\u003e\n  330xi L6 3.0L 2979cc 2004-2005\u003cbr\u003e\n  330xi L6 3.0L 2996cc 2006\u003cbr\u003e\n  Z4 L6 2.5L 2494cc 152cid 2003-2005\u003cbr\u003e\n  Z4 L6 3.0L 2979cc 2003-2005\n\u003c\/p\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eBMW - Europe Car\u003c\/strong\u003e\u003cbr\u003e\n  Z4 2200, M54 22 6S1 2003-2005\u003cbr\u003e\n  Z4 2500, M54 25 6S5 2003-2006\u003cbr\u003e\n  Z4 3000, M54 30 6S3 2003-2006\u003cbr\u003e\n  Z4 (E85) Eng.M54 B22 (226S1) 2.2 i 125kW M54 B22 (226S1) 2003-2005\u003cbr\u003e\n  Z4 (E85) Eng.M54 B25 (256S5) 2.5 i 141kW M54 B25 (256S5) 2003-2005\u003cbr\u003e\n  Z4 (E85) Eng.M54 B30 (306S3) 3.0 i 170kW M54 B30 (306S3) 2003-2005\n\u003c\/p\u003e\n\n\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eGenuine OEM replacement part\u003c\/li\u003e\n  \u003cli\u003eManufactured to original factory specifications\u003c\/li\u003e\n  \u003cli\u003eRegulates alternator output voltage\u003c\/li\u003e\n  \u003cli\u003eHelps maintain proper battery charging\u003c\/li\u003e\n  \u003cli\u003eSupports stable charging system performance\u003c\/li\u003e\n  \u003cli\u003eOriginal fit, function, and electrical characteristics\u003c\/li\u003e\n  \u003cli\u003eIdeal for alternator rebuilding and repair\u003c\/li\u003e\n  \u003cli\u003eEngineered for long-term reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat Does a Voltage Regulator Do?\u003c\/h2\u003e\n\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp\u003eA 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.\u003c\/p\u003e\n\n\u003ch2\u003eCommon Signs Replacement Is Needed\u003c\/h2\u003e\n\n\u003cp\u003eReplace the voltage regulator if you notice:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eBattery overcharging\u003c\/li\u003e\n  \u003cli\u003eBattery not charging\u003c\/li\u003e\n  \u003cli\u003eLow charging voltage\u003c\/li\u003e\n  \u003cli\u003eHigh charging voltage\u003c\/li\u003e\n  \u003cli\u003eBattery warning light illuminated\u003c\/li\u003e\n  \u003cli\u003eIntermittent charging problems\u003c\/li\u003e\n  \u003cli\u003eHeadlights that brighten or dim with engine speed\u003c\/li\u003e\n  \u003cli\u003eCharging system failure during testing\u003c\/li\u003e\n  \u003cli\u003eVoltage regulator failure discovered during alternator rebuilding\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Recommendations\u003c\/h2\u003e\n\n\u003cp\u003eInstallation 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.\u003c\/p\u003e\n\n\u003cp\u003eAlways verify connector configuration and mounting style before installation. After assembly, bench-test the alternator to confirm proper charging voltage and overall charging system performance.\u003c\/p\u003e\n\n\u003ch2\u003eWhile You're Rebuilding\u003c\/h2\u003e\n\n\u003cp\u003eInspect other common wear components to help maximize charging system reliability:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Bearing\u0026amp;sort_by=best-selling\"\u003eBearings\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Brushes\u0026amp;sort_by=best-selling\"\u003eBrushes\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Brush+Holder\u0026amp;sort_by=best-selling\"\u003eBrush Holder\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Slip+Ring\u0026amp;sort_by=best-selling\"\u003eSlip Rings\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Rectifier\u0026amp;sort_by=best-selling\"\u003eRectifier\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Diode\u0026amp;sort_by=best-selling\"\u003eDiodes\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Rotor\u0026amp;sort_by=best-selling\"\u003eRotor\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Clutch+Pulley\u0026amp;sort_by=best-selling\"\u003eClutch Pulley\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/rcautoelectric.com\/collections\/alternator-parts?filter.p.product_type=Insulator\u0026amp;sort_by=best-selling\"\u003eInsulators\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Buy From RC Auto Electric?\u003c\/h2\u003e\n\n\u003cp\u003eRC Auto Electric specializes in genuine OEM and premium aftermarket alternator and starter rebuilding components for professional rebuilders, repair shops, automotive technicians, and DIY enthusiasts. Our extensive catalog includes thousands of electrical components backed by accurate cross-reference information to help simplify part identification and reduce ordering mistakes.\u003c\/p\u003e\n\n\u003ch2\u003eDisclaimer\u003c\/h2\u003e\n\n\u003cp\u003eCompatibility information is provided as a reference only. Manufacturing revisions, production changes, and previous rebuilding modifications may affect internal alternator components. Always compare the original OEM part number, 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.\u003c\/p\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":47229507928318,"sku":"IB5219OEM","price":90.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/4432\/3582\/files\/w080-48n_l_1.jpg?v=1756543186","url":"https:\/\/rcautoelectric.com\/products\/oem-alternator-voltage-regulator-ib5219","provider":"RC Auto Electric Parts","version":"1.0","type":"link"}