Roots Dual Headlamp Relay 12V 30A (Original) – Universal Headlight/Fog/Projector Relay for Bikes & Cars – Protects Switch + Reduces Voltage Drop

The simplest “electrical upgrade” that actually saves your switchgear. Roots Dual Headlamp Relay (12V 30A) routes heavy current through a relay instead of your handlebar/combination switch—helping reduce voltage drop and improving light stability for dual headlamps, fog lights, or projector setups. Genuine Roots unit, packed and shipped by Under The Hood

If your headlights feel weak, fluctuate with rpm, or your switchgear heats up over time, the root cause is often the same: your switch and thin OE wiring are carrying more current than they should. The Original Roots Dual Headlamp Relay (12V 30A) fixes this the correct way—by using the switch only as a small “signal,” while the relay handles the heavy load.

This is why electricians recommend a relay when you run twin headlights, fog lamps, auxiliary/projector lights, or upgraded halogen/LED setups. It helps minimize voltage drop, improves consistency (reducing the “weak beam” feeling caused by wiring losses), and protects the expensive combination switch from overload-related wear.

Unlike generic relays, Roots is a known automotive electrical manufacturer and publishes headlamp relay specifications in the 12V / 30A class. You get a compact relay solution that’s widely serviceable and easy to replace later, which matters for long-term reliability.

Why buy from Under The Hood: enthusiast-run store + service ecosystem, correct packing, and practical fitment guidance so you don’t waste time on wrong wiring or poor installs.

KEY FEATURES & BENEFITS 

• Original Roots dual headlamp electrical relay (genuine sourcing)

• 12V, 30A rating – suitable for common bike/car lighting circuits

• Helps protect the combination/headlight switch from high current load

• Helps minimize voltage drop for improved light performance

• Supports twin headlamps / fog lamps / projector setups

• Works with halogen or LED setups where a relay feed is appropriate

• Universal 12V concept – used across bikes and cars (fitment depends on wiring + mounting)

• Easy to service later: standard relay format, widely understood by electricians

• A clean reliability upgrade for touring vehicles and night-driving builds

TECHNICAL SPECIFICATIONS

• Brand: Roots

• Product Type: Dual headlamp electrical relay

• Voltage: 12V

• Current Rating: 30A

• Application: Headlamps / dual headlamps / fog lamps / projector circuits

• Terminal material / housing material: Roots states headlamp relays use glass-filled nylon housing and copper terminals (manufacturer-level relay info).

• Included fuse / wire gauge: — not clearly specified on this product page (do not assume)

• System type: 12V vehicles only (not 24V)

COMPATIBILITY SECTION

a) Confirmed Compatible Models (what your page claims as universal examples)

Because this is a universal 12V relay, “compatibility” is best expressed as vehicle electrical type + use-case, not as a guaranteed model list. Your page lists examples across bikes and cars; treat them as common applications and keep a check-before-ordering gate.

b) ❓ Likely / Popular Retrofits (Check Before Ordering)

• Royal Enfield / KTM / Yamaha / Bajaj / TVS / Hero bikes where owners add auxiliary/projector/fog-style setups.

• Cars/SUVs adding fog lamps or improving headlamp reliability.

Check before ordering: verify your circuit needs 12V, confirm mounting space, and confirm relay pin layout/wiring plan with your electrician.

c) Not Compatible / Common Confusion

• 24V systems (some trucks/buses/commercial setups).

• If you need a full H4 plug-and-play harness kit, that’s a different product (your H4 wiring kit page).

• “Flicker” caused by poor-quality LED drivers/CANBUS issues: relay may not solve that; diagnose first.

VARIANTS (IF APPLICABLE)

No variants indicated for this SKU. If you later add variants, recommended names:

• 12V 30A – Single (Relay Only)

• 12V 30A – Relay + Harness (if bundled)
  (Only create these if your physical packing actually differs.)

WHAT’S IN THE BOX

As per your product page:

• 1 × Roots Dual Headlamp Relay (12V 30A)

• Integrated wiring harness with terminals (as stated)

• Original Roots box packaging

Note: Fuse/extra couplers are not specified for this item on the page—don’t promise them.

INSTALLATION & MAINTENANCE NOTES

• Install by a qualified electrician/mechanic; incorrect wiring can damage lights or wiring.

• Use correct fusing on the supply line as per your circuit load (best practice).

• Keep connections tight and grounded properly; poor ground reduces output.

• Mount relay away from direct water splash and high heat areas.

• Recheck connections after 3–7 days of use, especially on touring builds.

FAQ 

Q1) What does a dual headlamp relay actually do?
It allows the headlight switch to trigger the relay while the relay carries the heavy current—helping protect the switch and reduce voltage drop.

Q2) Can I use this for fog lamps or auxiliary/projector lights?
Yes, your product is positioned for twin headlight/fog/projector support, provided your vehicle is 12V and the wiring is done correctly.

Q3) Will this make my headlights brighter?
It can improve real-world performance by reducing voltage drop and stabilizing supply—especially on older wiring. Results depend on bulb type, reflector/projector quality, and wiring health.

Q4) Is this relay compatible with LED headlights?
It can be used in LED/halogen setups where a relay feed is appropriate. If your LED kit flickers due to driver/CANBUS issues, relay alone may not fix it—diagnosis matters.

Q5) Does it come with a fuse?
This product page does not clearly specify an included fuse. If your circuit needs a fuse (recommended), your electrician should add the correct rating.

Q6) Will it fit my Royal Enfield / KTM / car model?
This is a universal 12V relay, so fitment depends on wiring design and mounting—not only the model name. If it’s a 12V system and your electrician is adding/relaying the circuit, it can be used.

Q7) Can I install it at home?
If you understand relay wiring and fusing, yes. Otherwise, get it installed professionally to avoid shorts or overheating.

Q8) When should I NOT buy this?
If you specifically want a full H4 plug-and-play harness kit, choose the H4 relay harness product instead.