{"product_id":"royal-enfield-rr-unit-single-phase-rac00037d","title":"Regulator Rectifier (RR Unit) – Single Phase for Royal Enfield (Match by Connector) – RAC00037\/D (Also searched: RAC00037)","description":"\u003cp\u003e\u003cstrong\u003eRoyal Enfield RAC00037\/D\u003c\/strong\u003e (also searched as \u003cstrong\u003eRAC00037\u003c\/strong\u003e) is a genuine OEM \u003cstrong\u003eRR Unit – Single Phase\u003c\/strong\u003e, i.e., the \u003cstrong\u003eregulator rectifier\u003c\/strong\u003e for single‑phase charging systems. The RR unit converts AC from the stator to DC and regulates voltage to keep the battery charging correctly and protect electrical components from over\/under‑voltage.\u003c\/p\u003e\n\u003cp\u003eReplace the RR unit when you face symptoms such as \u003cstrong\u003ebattery not charging\u003c\/strong\u003e, frequent battery drain, \u003cstrong\u003eheadlight flicker\u003c\/strong\u003e, blown bulbs, erratic meter behaviour, or repeated fuse failures linked to unstable voltage. A correct OEM unit matters because wrong connector\/pin layout or wrong phase type can lead to charging faults, wiring overheating, and repeat failures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e regulator rectifier, RR unit, voltage regulator, rectifier, charging regulator, single phase RR, battery not charging fix, voltage fluctuation fix.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore you buy:\u003c\/strong\u003e single‑phase RR units vary by \u003cstrong\u003econnector style\/pin layout and mounting\u003c\/strong\u003e. Please match your old unit by \u003cstrong\u003epart number (RAC00037\/D\/RAC00037) + clear rear-connector photo\u003c\/strong\u003e before dispatch for return‑prevention.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM Royal Enfield part number \u003cstrong\u003eRAC00037\/D\u003c\/strong\u003e (RR UNIT - SINGLE PHASE)\u003c\/li\u003e\n\u003cli\u003eSingle‑phase charging regulator\/rectifier (do not use on 3‑phase systems)\u003c\/li\u003e\n\u003cli\u003eHelps maintain stable charging voltage and protects electricals from spikes\u003c\/li\u003e\n\u003cli\u003eCommon fix for charging issues: battery drain, flickering lights, voltage fluctuations\u003c\/li\u003e\n\u003cli\u003eOEM connector fitment and electrical spec (verify connector\/pins by photo)\u003c\/li\u003e\n\u003cli\u003eMRP references often list “RR unit single phase with capacitor” for this number (market listing)\u003c\/li\u003e\n\u003cli\u003eReturn‑prevention: connector photo + mounting verification supported before shipping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility Table \u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003ePlatform\/Engine\u003c\/th\u003e\n\u003cth\u003eBS\/Emission\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eStatus (✅\/❓)\u003c\/th\u003e\n\u003cth\u003eNotes\/Constraints\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoyal Enfield models using RR Unit Single Phase with this exact part number\u003c\/td\u003e\n\u003ctd\u003eVaries\u003c\/td\u003e\n\u003ctd\u003eVaries\u003c\/td\u003e\n\u003ctd\u003eVaries\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eOfficial dealer EPC page confirms part identity (RAC00037\/D) but does not expose a reliable model list in the public view; order only by \u003cstrong\u003epart number + connector\/pin photo match\u003c\/strong\u003e.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBullet X 350 (single‑phase charging)\u003c\/td\u003e\n\u003ctd\u003eJ‑platform 350\u003c\/td\u003e\n\u003ctd\u003eBS6\/OBD\u003c\/td\u003e\n\u003ctd\u003eVaries\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eMarketplace listings claim Bullet X 350 usage, but this is not a trusted dealer fitment proof. Verify by old unit photo and\/or VIN parts list.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAny 3‑phase charging model\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eNot for 3‑phase RR systems\u003c\/strong\u003e. If your bike uses a 3‑phase RR (e.g., RAC00079\/B on many UCE), do not buy this.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eVariants\u003c\/h2\u003e\n\u003cp\u003eNo variants.\u003c\/p\u003e\n\u003ch2\u003eFAQs \u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1 (Fitment): How do I confirm RAC00037\/D fits my bike?\u003c\/strong\u003e\u003cbr\u003eMatch three things: (1) your old RR unit part number is \u003cstrong\u003eRAC00037\/D\u003c\/strong\u003e or referenced as \u003cstrong\u003eRAC00037\u003c\/strong\u003e, (2) your system is \u003cstrong\u003esingle‑phase\u003c\/strong\u003e, and (3) the \u003cstrong\u003erear connector\/pin layout + mounting holes\u003c\/strong\u003e match your existing unit. Share a clear photo of the connector and mounting before dispatch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2 (Fitment): Will this work on all Royal Enfield 350\/500\/650 models?\u003c\/strong\u003e\u003cbr\u003eNo. RR units vary by phase type and connector. Treat “fits all” claims as risky—order only after connector\/pin photo match and parts‑list confirmation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3 (Comparison): Single‑phase vs 3‑phase RR unit—what’s the difference?\u003c\/strong\u003e\u003cbr\u003eA single‑phase RR is designed for single‑phase stators and wiring. 3‑phase RR units are for 3‑phase stators and have different electrical characteristics\/connectors. Using the wrong type can cause charging faults or wiring damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4 (Installation): Any precautions while installing?\u003c\/strong\u003e\u003cbr\u003eDisconnect the battery, mount the RR on the correct heat‑sink bracket, ensure the connector is fully seated, and route the harness away from hot exhaust parts. After installation, verify charging voltage with a multimeter as per service practice.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5 (Symptoms): What problems does this RR unit solve?\u003c\/strong\u003e\u003cbr\u003eBattery not charging, low charging voltage, overcharging (bulbs blowing), headlight flicker, intermittent electrical behaviour caused by unstable regulation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ6 (Returns-prevention): What should I send you before shipping?\u003c\/strong\u003e\u003cbr\u003eSend (1) photo of your existing RR unit front + rear connector, (2) your bike model\/year, and (3) any VIN\/EPC screenshot showing RAC00037\/D. This prevents wrong connector\/phase type orders.\u003c\/p\u003e","brand":"Royal Enfield (Genuine OEM)","offers":[{"title":"Default Title","offer_id":51090881577255,"sku":"RAC00037\/D","price":910.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/Regulator_Rectifier_RR_Unit_Single_Phase_for_Royal_Enfield_Match_by_Connector_RAC00037_D_Also_searched_RAC00037.jpg?v=1772439292","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-rr-unit-single-phase-rac00037d","provider":"UNDER THE HOOD","version":"1.0","type":"link"}