Simtac UV4W-SL6 Universal Multimode Switchless Hazard Flasher (V6.0) for 12V Motorcycles & Scooters – 35+ Patterns, 10W x 4, Waterproof

Riders who tour at night, in hill sections or heavy rain know one thing very well – stock indicators are not enough when traffic suddenly slows down or you’re parked at the roadside. You need all four indicators flashing together, instantly, in a pattern that other drivers cannot ignore.

The Simtac UV4W-SL6 universal multimode hazard flasher is a switchless V6.0 module that converts your existing indicator circuit into a smart hazard system using only the stock indicator switch – no extra handlebar button, no ugly toggle switch. To turn hazards ON/OFF or cycle between patterns, you simply move the indicator switch in specific Left-Right-Center sequences as per Simtac’s instructions.

Built for any 12V bike or scooter, the UV4W-SL6 drives up to 10W × 4 indicators, offers 35+ flashing modes (quick, slow, police-style, etc.), remembers the last pattern, and is highly water-resistant and shock-proof thanks to industrial-grade components and sealed construction.

Real riders use this module on everything from commuter bikes and scooters to Pulsars, Unicorns and other popular models – with many reporting 4–6+ months of trouble-free use and even a “welcome light” effect when the ignition is turned on.

Buying from Under The Hood means: genuine Simtac stock, GST invoice, careful packing, and real workshop support on wiring, LED compatibility and safe usage – not guesswork from generic sellers.

Key Features

• Universal switchless hazard flasher (UV4W-SL6, V6.0 SL-series) – works with almost any 12V motorcycle or scooter indicator circuit.

• 35+ multimode patterns – quick flash, slow flash, patrol/police-style and more, so you can choose the pattern that suits your ride situation.

• Switchless control – hazards fully controlled by the stock indicator switch using LEFT-RIGHT-CENTER combinations; no extra handlebar switch needed.

• High power rating – 10W × 4 outputs – designed for 4 indicators up to 10W each; ideal for LED or low-watt bulbs (not recommended for 21W halogens).

• Memory function – stores the last used pattern and recalls it automatically when you next activate hazards.

• Highly water-resistant & shock-proof construction with industrial-grade components for Indian monsoon, heat and rough roads.

• Improved visibility & safety – flashes all four indicators together so you’re visible from far away in fog, rain, highway jams or roadside breakdowns.

• 12-month replacement warranty from Simtac, with strong feedback (4.94/5 average rating from 34 riders on the brand site).

• Made in India by Simtac Automation (Karnal, Haryana) – established specialist in hazard flashers and indicator electronics.

Compatibility Table

Electrical requirement: 12V indicator circuit, four indicators (front + rear), total indicator load up to 10W per side (recommended for LED / low-watt bulbs).

Important:

• Module is “universal”, but wiring can vary from bike to bike. Always follow the Simtac wiring diagram or get it fitted by an experienced auto electrician.

• Do not use with indicator bulbs rated above 10W each, as Simtac explicitly warns against running higher-watt bulbs.

Variants

This listing is for the Simtac UV4W-SL6 Universal Multimode Hazard Flasher – Switchless (SL-Series, V6.0) only.

• No external switch is included or required – control is via stock indicator switch patterns.

• If a customer specifically wants a “with switch” hazard module (e.g., UV-WS4 or other Simtac WS-series), that should be listed as a separate product with its own images and wiring notes.

7. What’s in the Box

• 1 × Simtac UV4W-SL6 Universal Multimode Hazard Flasher Module (switchless, universal)

• 1 × Set of spare fuses for the integrated in-line fuse holder (quantity as per current Simtac packaging batch)

• 1 × Basic wiring / connection guide (printed diagram on card or inside package)

• 1 × Tax invoice from Under The Hood (required for warranty & service support)

Installation & Usage Notes

• Professional installation strongly recommended. This is a universal wiring module, not a plug-and-play bike-specific harness. Incorrect wiring can blow fuses or damage electrical components.

• Follow the Simtac wiring diagram exactly – the module usually sits between the indicator switch and the left/right indicator circuits, plus a connection to ignition/12V and ground.

• Confirm your indicator bulb wattage. The module is rated for 10W × 4; if your bike still runs 21W halogen indicators, switch to LED or low-watt bulbs before using this module.

• After installation, test: normal left/right indicator function, hazard ON/OFF, next/previous pattern selection, and that the fuse does not blow on extended usage.

• Use hazard lights responsibly – mainly for highway breakdowns, mountain sections, very heavy rain/fog, or group rides. Avoid using complex patterns in dense city traffic where it may confuse other drivers.

• Keep at least one spare fuse taped to the harness or stored under the seat – a few user reviews mention blown fuses, easily solved by replacing with a correct-value spare.

• If your bike has lots of added lights (aux fogs, LED strips, etc.), ensure total electrical load is within your bike’s charging system capacity before adding hazard flashing.

FAQs 

Q1. Will the Simtac UV4W-SL6 fit my bike or scooter?
If your vehicle has a 12V indicator circuit with four indicators, this universal flasher will usually work. It is not bike-specific; it connects into your indicator wiring using the provided diagram. We still recommend professional installation, especially on modern bikes with complex wiring or consoles.

Q2. Do I need to add a separate hazard switch on the handlebar?
No. UV4W-SL6 is a switchless SL-series flasher. Hazards are controlled using your existing indicator switch with special LEFT-RIGHT-CENTER movements to turn ON/OFF and change patterns, as described by Simtac.

Q3. Is this safe to use with stock halogen indicators?
The module is rated for 10W × 4 outputs and Simtac clearly notes not to run bulbs above 10W. Many stock indicators are 21W, so the safest approach is to switch to LED or lower-watt indicators before using this unit. Running very high-watt bulbs may repeatedly blow the fuse or damage the module.

Q4. Will this affect my bike’s warranty?
Because installation involves tapping into the indicator wiring, OE warranty impact depends on your manufacturer and the way the wiring is done. A neat, reversible installation done via couplers/adapter harness and proper fusing is usually accepted better than crude wire cutting. If your bike is under full warranty, check with your service centre or have the module installed in a fully reversible way.

Q5. Does it remember my last pattern or reset every time?
Yes, UV4W-SL6 comes with a memory feature – it stores the last used pattern, so when you turn hazards on again it recalls the same mode automatically.

Q6. Can I use this on Royal Enfield / KTM / high-end bikes?
Yes, as long as the bike uses a standard 12V indicator system and total indicator wattage does not exceed the module rating. Many riders use this module on RE, KTM and other premium bikes, but professional installation and proper load management are especially important on these machines.