1040003/A Royal Enfield Switch Module RH (Right-Hand Handlebar Switch) for Thunderbird 500 ABS BS4 | Genuine OEM

If your starter button, kill switch, headlight/hi-low, or switch functions on the right handlebar have become intermittent, sticky, or completely dead, this is the correct Genuine Royal Enfield OEM replacement: 1040003/A Switch Module RH. It is designed for the right-hand (throttle side) control cluster used on the Royal Enfield Thunderbird 500 ABS (BS4) as per the Royal Enfield spares portal compatibility.

Unlike many aftermarket switch blocks that may look similar but cause loose fitment, connector mismatch, or early electrical failure, an OEM switch module is built for the bike’s original wiring harness geometry and switch feel. This helps maintain reliable starting, consistent engine cut-off safety via kill switch, and predictable lighting control—critical for daily riding and highway touring.

Best for riders facing: self-start not responding, kill switch cutting off randomly, switch buttons jammed, or water-damage/oxidation inside the switch housing. Replace the full module instead of temporary jugad wiring to reduce repeat failures and prevent roadside issues.

(Part identification: Royal Enfield catalog description lists 1040003/A = “SWITCH MODULE RH”.) 

Key Features 

• Genuine Royal Enfield OEM right-hand switch module (RH)

• Confirmed application: Thunderbird 500 ABS – BS4 (Euro/BSIV generation) (official compatibility reference)

• Restores proper function of starter/engine cut-off & RH control buttons (as per OE design)

• OEM connector standard (no cutting/splicing recommended)

• Ideal fix for intermittent self-start, dead buttons, worn contacts, water ingress/oxidation

• Durable housing + OE-grade switchgear feel vs common aftermarket units

• Reduces return/risk by ensuring correct RH-side assembly (not LH)

• Suitable for maintenance + restoration of Thunderbird 500 ABS BS4

Compatibility Table

PLEASE CHECK PART NUMBER BEFORE PURCHASE 

RE portal model codes shown under compatibility (for this part): 1800224, 1800225, 1800226, 1800227 (Thunderbird 500 – BSIV variants).
⚠️ Not listing any other models (Classic/Bullet/Thunderbird X/etc.) because they are not confirmed for 1040003/A in the official compatibility you shared.

Variants

• RH only (Right-Hand / Throttle side)

• No color/finish variants listed for this part number

• If you need LH (Left-Hand) switch module, do not order this—RH and LH are not interchangeable.

FAQs 

1) Will 1040003/A fit my Classic 350 / Bullet 350 / Thunderbird 350 / Thunderbird X?
No claims made. This listing is only for Thunderbird 500 ABS (BS4) as per official compatibility. Many RE switch modules look similar across models, but connector pins and harness routing can differ, causing misfit and returns.

2) What symptoms indicate my RH switch module is failing?
Common symptoms: self-start button not working, starter works only when pressed hard, kill switch cutting off randomly, headlight/hi-low behaving inconsistently, or buttons feeling stuck due to dust/water ingress and worn internal contacts.

3) Does this include the throttle grip / throttle tube / wiring harness?
Typically, a “switch module” is the RH switch housing assembly only. It does not usually include throttle cable/tube/grip unless explicitly stated on the box. If you want, share your box photo and I’ll map exact “what’s in the box” from the label.

4) Can my mechanic repair the old switch instead of replacing it?
Sometimes cleaning contacts helps short-term, but if the unit has burnt contacts, cracked housing, or recurring moisture damage, replacement is more reliable—especially for touring where a no-start situation is costly.

5) Is installation plug-and-play? Any precautions?
For the correct confirmed model, it should match OE connectors. Recommended: disconnect battery first, avoid pin damage, ensure proper cable routing, and check throttle free-play after refit. If your bike has previous wiring modifications, verify before installation.