Main Wiring Harness / Harness Main Cable for Royal Enfield Bullet Standard 350 (BS4, 2017, KS, Non-ABS) | 1040445/B | Genuine OEM

Electrical issues on older Bullets usually start with the wiring: brittle insulation, previous “tape-joint” repairs, loose connectors, or melted sections near the fuse/charging circuit. Royal Enfield 1040445/B is the Genuine OEM “HARNESS MAIN CABLE”—the complete main wiring harness that links your bike’s electrical components (ignition, charging, lighting, switches, etc.) to the primary circuit in a factory-correct layout.

This harness is the right fix when you’re facing recurring fuse blows, intermittent lights, starter cut-outs, or unreliable ignition caused by damaged wiring—not by individual parts. Replacing the full harness also improves reliability versus repeated patch repairs, which often fail again under heat, vibration, and moisture.

Fitment is model-variant sensitive. Royal Enfield uses different harness part numbers across years/variants (ES/KS, ABS/Non-ABS, emissions versions). This listing includes only the confirmed application below. If your exact variant differs, please verify 1040445/B via old-part match or VIN/microfiche before ordering.

Key Features

• Genuine Royal Enfield HARNESS MAIN CABLE – Part No. 1040445/B 

• Restores factory-grade wiring integrity (ideal for rewiring / restoration)

• Reduces issues from cut/spliced wiring: intermittent power, shorts, repeat fuse blowing

• OEM routing + connector style for cleaner, safer fitment (when matched to correct variant)

• Also commonly referred to as Main Wiring / Wiring Harness 

• HSN indicated in official-style price list: 85443000 (useful for invoicing) 

• Best practice replacement when harness insulation is hardened/cracked or connectors are burnt

Compatibility Table 

Not confirmed / excluded (❓ Verify): Bullet ES variants, ABS variants, other years, Classic/Electra/Thunderbird, and all J-Series / 650 / Himalayan platforms.

Variants

• Single unit (1 set) – Main Wiring Harness / Harness Main Cable 1040445/B (no LH/RH)

FAQs 

Q1) Is 1040445/B the full main wiring harness or a small sub-wire?
It is listed as HARNESS MAIN CABLE (main wiring harness). 

Q2) Will this fit Bullet 350 Electric Start or ABS models?
Not confirmed. Wiring harness fitment changes by variant. Order only if your bike is confirmed to use 1040445/B. 

Q3) My bike has intermittent lights / fuse blowing—will a harness replacement fix it?
If the root cause is cracked insulation, melted sections, corroded connectors, or repeated splice repairs, a full harness replacement is often the correct long-term fix.

Q4) Do I need a mechanic for installation?
Strongly recommended. Harness replacement involves routing, connector checks, correct clamping, and avoiding pinch points.

Q5) What should I match before ordering?
Match part number 1040445/B, your old harness connector layout, and your exact variant (KS/ES, ABS/Non-ABS, year).