Genuine HERO AC Generator Assembly (Stator / Charging Coil) – HDH31100RAA001S | Harley-Davidson X440 / 440X & Hero Mavrick 440 (Fitment Verify)

Weak charging, a battery that keeps dying, dim/unstable lights, or sudden electrical cut-outs are classic symptoms of a failing AC generator/stator assembly. The AC GEN Assembly (HDH31100RAA001S) is listed as a genuine HERO charging component and is intended to restore proper power generation for the bike’s electrical system—supporting reliable battery charging and consistent electrical performance. 

This is not a part where “local rewinding” or generic substitutes are recommended for a premium 440 platform bike—charging components need correct winding spec, insulation quality, and stable output to prevent repeat failures and avoid damaging the regulator/rectifier or battery.

Why buy from Under The Hood: We are building one of India’s most structured catalogues for Harley 440X / 440 platform spares with fitment-first selling to reduce wrong orders. If you share your VIN / RC, we can help you confirm whether HDH31100RAA001S matches your exact model/variant before dispatch.

Internal linking (recommended): Harley 440X spares category, electrical parts (battery, RR unit, sensors), and a future blog: “Harley X440 charging issues: symptoms, diagnosis, and correct parts.”

Key Features 

• Part Number / MPN: HDH31100RAA001S 

• Description (as listed): AC GEN ASSEMBLY 

• Manufacturer / Brand (as listed): HERO 

• Restores the bike’s charging generation function when stator/coil is weak or failed

• Helps address common issues like battery drain, fluctuating voltage symptoms, inconsistent lighting (after proper diagnosis)

• Better reliability vs “universal” or locally modified charging coils for premium 440 platform bikes

• Recommended for a clean electrical repair: replace with correct part number and inspect RR unit & connectors

• Under The Hood support available for VIN-based part verification before shipping

Compatibility Table 

Caution (Electrical Part): Always match the part number to your VIN/microfiche, and confirm connector style and mounting points before installation.

Variants (if any)

• No verified variants found for HDH31100RAA001S in public listings. 

What’s in the Box

• 1 × AC GEN Assembly – HDH31100RAA001S 
  Not included: regulator/rectifier (RR unit), battery, flywheel/rotor, gaskets, or any electrical connectors unless pre-attached in the OEM pack.

Installation & Maintenance Notes

• Recommend professional installation; charging components sit inside the engine-side cover area.

• Inspect/clean connectors and wiring before fitting; many charging issues are connector-related.

• After installation, verify charging behaviour using proper diagnostic methods (avoid guessing).

• If the old stator failed due to heat or oil contamination, check related seals/cover integrity as per your bike’s service process.

• Do not invent torque specs—follow the model-specific service manual.

FAQs 

Q1. What is HDH31100RAA001S exactly?
It is listed as AC GEN ASSEMBLY (AC generator/stator type charging component) under part number HDH31100RAA001S, with Manufacturer/Brand shown as HERO. 

Q2. Will this fit my Harley-Davidson X440 / 440X?
Yes it is made for Harley-Davidson X440 / 440X

Q3. Will this fit Hero Mavrick 440?
Yes but it is in Harley packing HDH31100RAA001S for your Mavrick 440 variant.

Q4. What symptoms suggest a stator/AC generator problem?
Repeated battery drain, dim/flickering lights, unstable electrical behaviour, or poor charging—after proper diagnosis (battery + RR unit + wiring should also be checked).

Q5. Should I rewind the old coil instead?
For premium 440-platform bikes, correct spec and insulation quality matter. A genuine replacement is typically the more reliable long-term fix.