Nippondenso 6.4V Turn Signal Flasher Relay FU645SD
Nippondenso 6.4V Turn Signal Flasher Relay FU645SD
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Product Description
Nippondenso factory 6.4V electronic/thermal turn signal flasher relay (FU645SD). Stamped with dual-terminal layout (B for Battery input, L for Load/Switch output) and integrated rubber mounting bracket marked 12V-10. Designed specifically for classic 6V Japanese motorcycles, scooters, and mopeds utilizing standard 21W turn signals and 3W indicator dashboard lamps.
Vehicle Compatibility
Verified fitment for classic 6V Japanese two-stroke and small-displacement platforms:
| Make | Model | Chassis / Engine Variant | Model Years |
| Honda | Monkey Z50 / Dax ST50 / Chaly | 49cc 4-Stroke Mini-Bike (6V Electrical Systems) | 1978–1983 |
| Yamaha | DT50 / RD50 / FS1E | 49cc 2-Stroke Street / Trail (6V Systems) | 1976–1984 |
| Suzuki | AP50 / TS50 / FR50 | 49cc 2-Stroke Small-Displacement (6V Systems) | 1978–1985 |
| Kawasaki | AR50 / GTO50 | 49cc 2-Stroke Commuter (6V Systems) | 1979–1984 |
Fitment & Technical Details
Plug-and-play replacement 6V two-pin flasher relay. Connect the main wiring harness positive feed to terminal B (Battery) and the flasher switch feed to terminal L (Load). Ensure stable 6V battery or magneto charging voltage; using this 6.4V relay on an unmanaged 12V conversion will cause rapid thermal bimetallic strip failure.
Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help!
At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand.
Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you.
We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction.
Shipping Information
We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability.
Please note:
- All parts are shipped from Cyprus (Europe).
- Customers outside the EU may incur additional import taxes based on the value of the item.
How we handle your order in 4 steps
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1. Order Verification
We confirm the order and make sure the correct part number, quantity, and any special requests match what’s on the sales confirmation
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2. Quality Check
Since our parts are new old stock we Inspect the parts for any defects, scratches, or missing components to ensure it meets quality standards. otherwise will notify you before proceeding with the order.
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3. Safe and Secure packaging
- Protective Wrapping: We use bubble wrap or foam padding to wrap the part, focusing on sharp edges or delicate components.
- Boxing: We place the wrapped part inside a sturdy box, filling gaps with packing materials to prevent movement.
- Sealing and Labeling: Securely tape the box and attach the shipping label, including orientation-specific markers like "Fragile."
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4. Finalizing of Shipment
We confirm the shipping address and contact details, give the package to the Post, keep the tracking number, and then send it to the customer along with the shipment notification.
