• Regulator Rectifier (RR Unit) – Single Phase for Royal Enfield (Match by Connector) – RAC00037/D (Also searched: RAC00037)
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Royal Enfield (Genuine OEM)

Regulator Rectifier (RR Unit) – Single Phase for Royal Enfield (Match by Connector) – RAC00037/D (Also searched: RAC00037)

Regulator Rectifier (RR Unit) – Single Phase for Royal Enfield (Match by Connector) – RAC00037/D (Also searched: RAC00037)

Rs. 910.00
Rs. 917.00 Rs. 910.00
Sale Sold out
Shipping calculated at checkout.
Important Order Policy
Please order only after confirming the part number, model, variant, year, side, connector type and compatibility. All orders are non-cancellable once placed. Correctly shipped spare parts are not eligible for return, exchange or refund due to wrong selection, wrong diagnosis, fitment mismatch, mechanic recommendation or change of mind. Electrical/electronic items are additionally non-returnable once opened, installed, plugged in, tested or used. Wrong item, damaged item or missing item claims require a complete unboxing video within 24 hours. Read full Return & Warranty Policy

Royal Enfield RAC00037/D (also searched as RAC00037) is a genuine OEM RR Unit – Single Phase, i.e., the regulator rectifier 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.

Replace the RR unit when you face symptoms such as battery not charging, frequent battery drain, headlight flicker, 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.

Also searched as: regulator rectifier, RR unit, voltage regulator, rectifier, charging regulator, single phase RR, battery not charging fix, voltage fluctuation fix.

Before you buy: single‑phase RR units vary by connector style/pin layout and mounting. Please match your old unit by part number (RAC00037/D/RAC00037) + clear rear-connector photo before dispatch for return‑prevention.

Key Features 

  • Genuine OEM Royal Enfield part number RAC00037/D (RR UNIT - SINGLE PHASE)
  • Single‑phase charging regulator/rectifier (do not use on 3‑phase systems)
  • Helps maintain stable charging voltage and protects electricals from spikes
  • Common fix for charging issues: battery drain, flickering lights, voltage fluctuations
  • OEM connector fitment and electrical spec (verify connector/pins by photo)
  • MRP references often list “RR unit single phase with capacitor” for this number (market listing)
  • Return‑prevention: connector photo + mounting verification supported before shipping

Compatibility Table 

Model Platform/Engine BS/Emission Years Status (✅/❓) Notes/Constraints
Royal Enfield models using RR Unit Single Phase with this exact part number Varies Varies Varies ❓ Official dealer EPC page confirms part identity (RAC00037/D) but does not expose a reliable model list in the public view; order only by part number + connector/pin photo match.
Bullet X 350 (single‑phase charging) J‑platform 350 BS6/OBD Varies ❓ Marketplace 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.
Any 3‑phase charging model — — — ❓ Not for 3‑phase RR systems. If your bike uses a 3‑phase RR (e.g., RAC00079/B on many UCE), do not buy this.

Variants

No variants.

FAQs 

Q1 (Fitment): How do I confirm RAC00037/D fits my bike?
Match three things: (1) your old RR unit part number is RAC00037/D or referenced as RAC00037, (2) your system is single‑phase, and (3) the rear connector/pin layout + mounting holes match your existing unit. Share a clear photo of the connector and mounting before dispatch.

Q2 (Fitment): Will this work on all Royal Enfield 350/500/650 models?
No. 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.

Q3 (Comparison): Single‑phase vs 3‑phase RR unit—what’s the difference?
A 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.

Q4 (Installation): Any precautions while installing?
Disconnect 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.

Q5 (Symptoms): What problems does this RR unit solve?
Battery not charging, low charging voltage, overcharging (bulbs blowing), headlight flicker, intermittent electrical behaviour caused by unstable regulation.

Q6 (Returns-prevention): What should I send you before shipping?
Send (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.

Verify Fitment on Official Brand Portals

For selected genuine spare parts, you can cross-check the part number on the official brand portals before ordering.

Royal Enfield Official Spares Portal

Hero MotoCorp Official eCatalogue

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