{"product_id":"oem-alternator-voltage-regulator-ib5881","title":"OEM Bosch Voltage Regulator IB5881","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\u003eFEATURE 2: BSS (COM) Regulator\u003c\/li\u003e\n  \u003cli\u003eFEATURE 3: COM ID Code: 31\u003c\/li\u003e\n  \u003cli\u003eNOTE 1: Terminal Identification: Bss\u003c\/li\u003e\n  \u003cli\u003eSPECS FOR: Bosch IR\/IF Alternator\u003c\/li\u003e\n  \u003cli\u003eSPECS: 12 Volt, B-Circuit, 10.6 - 16.0 Vset\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eUsed On\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eBMW (2006-2008)\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 7 540 657, 12 31 7 542 530, 7 540 657\u003cbr\u003e\n  \u003cstrong\u003eBosch:\u003c\/strong\u003e F 00M 145 317, F 00M 145 881, F 00M A45 222\n\u003c\/p\u003e\n\n\u003ch2\u003eLester Numbers\u003c\/h2\u003e\n\n\u003cp\u003e11077\u003c\/p\u003e\n\n\u003ch2\u003eUnit Numbers\u003c\/h2\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eBMW:\u003c\/strong\u003e 12-31-4-487-081, 12-31-4-487-081, 12-31-7-542-529, 12-31-7-542-529, 12-31-7-543-083, 12-31-7-543-083, 7542529-03\u003cbr\u003e\n  \u003cstrong\u003eBosch:\u003c\/strong\u003e 0 124 525 083, 0 124 525 524\u003cbr\u003e\n  \u003cstrong\u003eOriginal Reference Number:\u003c\/strong\u003e 302009RI, 89212506\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  323i L6 2.5L 2497cc 2006-2007\u003cbr\u003e\n  325i L6 3.0L 2996cc 2006\u003cbr\u003e\n  325xi L6 3.0L 2996cc 2006\u003cbr\u003e\n  550i V8 4.8L 4837cc 2006\u003cbr\u003e\n  650i V8 4.8L 4837cc 2006\u003cbr\u003e\n  750i V8 4.8L 4837cc 2006\u003cbr\u003e\n  750Li V8 4.8L 4837cc 2006\u003cbr\u003e\n  Z4 L6 3.0L 2996cc 2006-2008\n\u003c\/p\u003e\n\n\u003cp\u003e\n  \u003cstrong\u003eBMW - Europe Car\u003c\/strong\u003e\u003cbr\u003e\n  242 3000, N52 B30 2005-2007\u003cbr\u003e\n  3 (E90) Eng.N52 B25 A 325 i 155kW N52 B25 A 2006-2008\u003cbr\u003e\n  3 (E90) Eng.N52 B25 A 325 i 160kW N52 B25 A 2005-2008\u003cbr\u003e\n  3 (E90) Eng.N52 B25 A 325 xi 160kW N52 B25 A 2005-2008\u003cbr\u003e\n  3 (E90) Eng.N52 B25 A, N52N B25 A 323 i 130kW N52 B25 A 2006-2011\u003cbr\u003e\n  3 (E90) Eng.N52 B30 A 330 i 190kW N52 B30 A 2005-2007\u003cbr\u003e\n  3 (E90) Eng.N52 B30 A 330 xi 190kW N52 B30 A 2005-2007\u003cbr\u003e\n  3 (E90) Eng.N52N B30 A 328 i 187kW N52N B30 A 2005-2007\u003cbr\u003e\n  3 Convertible (E93) Eng.N52 B25 A 325 i 160kW N52 B25 A 2007-2008\u003cbr\u003e\n  3 Coupe (E92) Eng.N52 B25 A, N52 B25 C 325 i 160kW 2005-2008\u003cbr\u003e\n  3 Coupe (E92) Eng.N52 B25 A, N52 B25 C 325 xi 160kW 2006-2008\u003cbr\u003e\n  3 Touring (E91) 323 i 140kW 2006-2008\u003cbr\u003e\n  3 Touring (E91) Eng.N52 B25 A, N52 B25 C 325 i 160kW 2004-2008\u003cbr\u003e\n  3 Touring (E91) Eng.N52 B25 A, N52 B25 C 325 xi 160kW 2005-2008\u003cbr\u003e\n  3 Touring (E91) Eng.N52 B30 A 330 i 190kW N52 B30 A 2005-2007\u003cbr\u003e\n  3 Touring (E91) Eng.N52 B30 A 330 xi 190kW N52 B30 A 2005-2007\u003cbr\u003e\n  3 Touring (E91) Eng.N52N B25 A 323 i 130kW 2006-2007\u003cbr\u003e\n  325 2500, N52 B25 2005-2007\u003cbr\u003e\n  5 (E60) Eng.N52 B25 A 525 i 160kW N52 B25 A 2004-2007\u003cbr\u003e\n  5 (E60) Eng.N52 B25 A 525 xi 160kW N52 B25 A 2005-2007\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A 530 i 187kW N52 B30 A 2005-2010\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A 530 i 190kW N52 B30 A 2004-2007\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A 530 xi 190kW N52 B30 A 2004-2007\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A, N53 B30 A 530 i 200kW 2007-2009\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A, N53 B30 A 530 i xDrive 200kW 2007-2009\u003cbr\u003e\n  5 (E60) Eng.N52 B30 A, N53 B30 A 530 xi 200kW 2007\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B25 A 525 i 160kW N52 B25 A 2004-2007\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B25 A 525 xi 160kW N52 B25 A 2005-2007\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A 530 i 190kW N52 B30 A 2004-2007\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A 530 xi 190kW N52 B30 A 2005-2010\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A, N53 B30 A 525 xi 160kW 2007\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A, N53 B30 A 530 i 200kW 2007-2010\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A, N53 B30 A 530 i xDrive 200kW 2008-2010\u003cbr\u003e\n  5 Touring (E61) Eng.N52 B30 A, N53 B30 A 530 xi 200kW 2007-2010\u003cbr\u003e\n  6 (E63) Eng.N52 B30, N52 B30 A 630 i 190kW 2004-2007\u003cbr\u003e\n  6 Convertible (E64) Eng.N52 B30 A 630 i 190kW N52 B30 A 2004-2007\u003cbr\u003e\n  K15 3000, N52 B30 2005-2010\u003cbr\u003e\n  Savana 2500 2500, N52 B25 2005-2007\u003cbr\u003e\n  Stealth 3000, N52 B30 2005-2007\u003cbr\u003e\n  Vue 3000, N52 B30 2004-2007\u003cbr\u003e\n  Z4 3000, N52B30 2006-2010\u003cbr\u003e\n  Z4 (E85) Eng.N52 B25 A 2.5 i 130kW N52 B25 A 2006-2009\u003cbr\u003e\n  Z4 (E85) Eng.N52 B25 A 2.5 si 160kW N52 B25 A 2006-2009\u003cbr\u003e\n  Z4 (E85) Eng.N52 B30 A 3.0 si 195kW N52 B30 A 2006-2008\u003cbr\u003e\n  Z4 Coupe (E86) Eng.N52 B30 A 3.0 si 195kW N52 B30 A 2006-2009\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":47230210277630,"sku":"IB5881OEM","price":120.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/4432\/3582\/files\/w080-113n_l_2.jpg?v=1756543055","url":"https:\/\/rcautoelectric.com\/products\/oem-alternator-voltage-regulator-ib5881","provider":"RC Auto Electric Parts","version":"1.0","type":"link"}