H4 Kits

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Note that most 'Kits' are made to order and can take up to a week to prepare. You will notified when your order ships. If you're in a hurry you can pay for EMS shipping on my Shipping Page. EMS orders are prepared asap (2-3 days).

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motorcycle h4 headlight relay kits

Finally! An easy way to get a lot more light from your headlight. Plus, you can run a higher wattage headlight bulb without fears of overloading your electrical system or destroying your expensive lighting switches. Adding relays will make any bulb put out it's full intensity. Your headlight bulb's Voltage drop after installing this kit will be a mere .1 Volt! (that's point one Volt) You will be amazed at your stock bulb's output! Even on a brand new bike you will notice an incredible difference in the headlight output.

Easy Plug-In Install: Most H4 Kits just plug into your bike's existing wiring. No cutting of your bike's wiring is needed. You plug into your headlight bulb socket and headlight bulb, connect to the bike battery and you're all set!

Perfect Set of Components: Two high quality relays are provided - one for low beam, one for high beam. Included is a weather proof inline fuse holder, two fuses, and enough cable ties to strap the wiring to your bike. The H4 plug and coupler are heavy duty types.

Relay kits work fine with modulators!

Note About the 'Coupler Connection':

I'm now including two Posi-Locks PL1416 in each H4 Kit. These will give you the option of either using the H4 Coupler plug or cutting it off and using the Posi-Locks to connect to the bike's headlight wiring. This connection is to trigger the relays from your bike's HI/LO switch. There are some pros and cons for each as I will note here:

Option 1 - H4 Coupler Plug:

PROS: Easier install, just plugs into your old H4 Socket. Easy to remove later if you sell the bike. Easy to reconnect the old H4 socket to the bulb if you have a problem with the Kit. Note: I have never had anyone whose bike had a problem with a Relay Kit. Install it carefully and it will be as rugged and reliable as any other part of your motorcycle.

CONS: Coupler/Socket combo makes a bulky unit you have to wrap and tie up somewhere safely. It's more difficult to fit inside a crowded headlight shell. Old headlight H4 socket must be taped up to avoid shorting exposed terminals.

Option 2 - Posi-Lock Connectors:

PROS: Removes the bulky coupler/socket unit. Avoids poor connections with an old corroded plug. Makes installing inside a headlight shell easier with less bulk. Avoids any potential shorting of old H4 socket terminals.

CONS: Requires cutting off bike's old H4 Socket. Not as easy to remove Kit later if you sell the bike.

My Recommendations: I believe that a Relay Kit should be a permanent part of your bike. I like neat and tidy installs and I don't like old plugs and possible bad connections. Installing Posi-Lock connectors instead of the H4 Coupler really cleans up the area around the back of the headlight. Posi-Locks can be used to re-attach your old H4 Socket and remove the Relay Kit if you want to return the bike to it's original configuration.

NOTE: ALL H4 Kits Come with a Pair of Posi-Locks for alternate 'coupler' connection.

NEW - LO Beam Cut Adapter for H4 Single Kits

This Adapter will allow you to turn your headlight off while starting your bike. It will also allow you to limp home fi your battery is dying or not charging.

This feature is now an option with all my SINGLE Headlight Kits And it's very easy to fit to an existing Eastern Beaver Headlight Relay Kit. This Adapter will NOT work on H4 Dual Kits. See below for H4 Dual Kits with several beam cut options.

This Adapter can be ordered integrated into one of my Headlight Relay Kits, just order both together.

Or you can add it an existing Kit. Go here for a selection of switches. This Option only needs a low current switch as it works on the relay trigger circuit. (Shown below with the extra LED Jumper Option)

lo_cut_adapter_1319

Integrated into a Single Headlight Relay Kit (must buy both at same time) $9.95


Retro-Fit Version (for a Kit already bought or installed) $12.95


Adapter Only DIY Version (comes with complete H4 Coupler installed) $14.95


LED Jumper Extra (can go with any of the above 3 choices) $2.95


INSTRUCTIONS for Retro-Fitting:

NOTES: First run the wire from switch to the headlight relays, pulling to through the shell grommet. You can alternately run the wire out to the switch later after connecting the relays and H4 Coupler to the Adapter. If you're retro-fitting to an installed Kit you don't have to remove the whole Kit but may have to free the relays to manipulate them and plug in the adapter.

1 - unplug the relays - hold the latch down and wiggle and pull the relay out of its socket. Repeat for other relay.

2 - remove two terminals from the relay sockets using a small flat blade driver ground down or an extraction tool. Remove both terminals which have the H4 Coupler wires on them. There's one on each relay, top right position.

3 - plug in the Adapter's two Relay Terminals, white to where white came out, and red to where yellow came out. See below.

locutadapter-wiring_1320

4 - on existing Kits, remove one of the H4 Coupler's two wired terminals. Replace with the Adapter's matching wire colour's H4 Coupler terminal. Repeat for the other wire. If you removed your H4 Coupler when you installed, cut the Coupler terminals off and connect the wires directly using the two Posi-Locks, or your choice or methods (solder/wrap etc.

5 - run the switch wires to the switch if you haven't already, and plug into the switch. The red shrinktube covered wire is the hot switch feed, the black covered wire is the return. If you also ordered the LED Switch Jumper Option the short jumper goes to the LED POS tab. You might have to run a ground wire to the other LED tab.

6 - install or reinstall the Kit to the bike.


Heavy Duty Dis-Connector Option

This feature is now an option with all my Kits, using the heavy duty MetriPack 280 connector on the main leads 6" (15 cm) before the relays. This allows easy disconnection for fairing removal, etc. This option can ONLY be ordered with a Relay Kit.

This Metri-Pack connector can be order separately here.

Heavy Duty Disconnector Option $4.95


metricpack280-2P-b


H4 Single Headlight Relay Kits (Fairing mount option shown)

H4 Single Headlight Relay Kit

This Kit is available with short or longer bulb leads. The Fairing mount Kit shown above is for bikes with a fairing to mount the relays remotely from the headlight. The Shell mount Kit with shorter bulb leads is for bikes with a headlight shell to mount the relays inside.

Specifications:

Main leads 61" (155 cm)

Fairing option bulb leads 16" (40 cm) - allows the relays to be remotely mounted from the headlight

Shell option bulb leads 6" (15 cm) - allows the relays to be inside the headlight shell

Two heavy duty 20A Panasonic Relays with sockets

H4 Coupler to make installation easy by plugging into your stock headlight socket

Cooper-Bussman ATM Fuseholder with two 15A fuses and bullet connector to make running wires easy

6 cable ties to secure your Kit to your bike

Two Posi-Lock PL1416s are included to make a compact connection to your old bulb leads instead of the H4 Coupler (optional).

NEW LOWER PRICE $44.95

H4 Single Relay Kit

Bulb Lead Length
Main Leads Connection

Note: Fusepanel Option Kits - main lead wires are sheathed to 6 in (15 cm) from ends.


H4 Heavy Duty Single Headlight Relay Kits with Ceramic H4 Socket

H4F-HD-kit2

These Kits are the same as the H4 Single Headlight Relay Kits above, except that the H4 Socket is super high temperature ceramic. (Fairing Mount Length Shown) Not shown - ceramic socket is shrink-wrapped for protection from breakage.

Price $49.95

H4 Single Relay Kit Ceramic

Bulb Lead Length
Main Leads Connection

Note: Fusepanel Option Kits - main lead wires are sheathed to 6 in (15 cm) from ends.


H4 Heavy Duty Single 'Dual Beam' Headlight Relay Kits (LO beam on with HI)

H4F-HD-kit2

This Kit is the same as the H4 Single Headlight Relay Kit with Ceramic Socket, except that ON HI BEAM, LO BEAM REMAINS ON. If your bike already has this feature you can't use this Kit, the regular H4 Kits will retain that stock feature.

Please be aware of possible over-heating with both beams on.

A diode is placed into a short jumper between the relays. This Kit is also available with short or longer bulb leads. The Fairing mount Kit shown above is for bikes with a fairing to mount the relays remotely from the headlight. The Shell mount Kit with shorter bulb leads is for bikes with a headlight shell to mount the relays inside.

Price $52.95

H4 Single Dual Beam Relay Kit

Bulb Lead Length
Main Leads Connection

Note: Fusepanel Option Kits - main lead wires are sheathed to 6 in (15 cm) from ends.


H4 Single Headlight Weatherproof Relay Kit

H4 Single Weatherproof Headlight Relay Kit

This Kit is specially for bikes like the BMW R1100GS which has a tight fitting headlight housing cover. Also, this Kit is for bikes with a very small headlight shell. This Kit allows easy insertion of the bulb leads into the headlight shell. The Kit is shipped with bulb leads out of the socket and they are then plugged in after installing in the headlight housing. The relays can be mounted further back, either in the fairing or under the front of the fuel tank. The relays are shrink wrapped to keep out dirt and moisture.

Specifications:

- Main leads 57" (145 cm)

- Bulb leads 20" (50 cm)

- Posi-Locks instead of H4 Coupler

NEW LOWER PRICE $44.95

H4 Single Weatherproof Relay Kit

Main Leads Connection

Note: Fusepanel Option Kits - main lead wires are sheathed to 6 in (15 cm) from ends.


H4 Single Positive Ground Headlight Relay Kit

H4 Single Positive Ground Headlight Relay Kit

This Kit is specially for older British and other makes which have a positive ground electrical system. This Kit is basically the same as the regular H4 Single Kit In Shell model, except the wire colours are reversed with red wiring for the ground circuits. Specially priced for British Bike enthusiasts!

NEW LOWER PRICE $42.95

H4 Single Positive Ground Relay Kit



H4 Dual Headlight Relay Kit

H4 Dual Headlight Relay Kit

This Kit is specially for bikes with dual H4 headlights.

Price $54.95

H4 Dual Relay Kit

Main Leads Connection

Note: Fusepanel Option Kits - there is no fuseholder, main leads are sheathed to 6 in (15 cm) from ends.


H4 Dual Headlight Relay Kit with Relay On/Off Switching
h4dual-full-switching_0018

This Kit is specially for bikes in countries where headlights are not allowed to be automatically on during the daytime, or, for those who want to have full ON/OFF switching abilities. This Kit will switch both beams of both headlights using 2 independent SPST switches (one for each beam), or one DPST switch (for both beams).

Switching takes place on the low current relay trigger wires, not on the headlight bulb wires, thereby giving you full power to both headlights without any Voltage drop inherent in in-line bulb lead switching.

Price $64.95

H4 Dual Relay Kit with Full ON/OFF Switching

Main Leads Connection


H4 Dual Headlight Relay Kit with LO Beam On/Off Switching
h4d-lobeam-switch_0311

This Kit switches one relay (LO Beam) on and off therefore keeping light output high without Voltage drop.

This Kit is specially for those who want the ability to cut their headlight at startup or for any other reason.

This Kit will switch the LO beam of BOTH headlights using a SPST switch.

See my Switches Page for a switch for this Kit.

Switching takes place on the low current LO beam relay trigger wire, not on the headlight bulb wires, thereby giving you full power to both headlights without any Voltage drop inherent in in-line bulb lead switching.

Price $62.95

H4 Dual Relay Kit with LO Beam ON/OFF Switching

Main Leads Connection


H4 Dual Headlight Relay Kit with One Bulb/One Beam On/Off Switching
h4d-lobeam-switch_0311

This Kit puts the switch in-line on the short bulb lead therefore resulting in a very small Voltage drop to that bulb when on.

This Kit is specially for bikes with low output alternators whose riders want to conserve power for other uses.

This Kit will switch ONE beam of ONE headlight using a 10A or better SPST switch.

See my Switches Page for a switch for this Kit.

You can order this Kit for one LO or one HI beam.

Price $59.95

H4 Dual Relay Kit with One bulb One Beam ON/OFF Switching

Main Leads Connection
Beam Cut Choice


H4 Safety Alert - IMPORTANT!

Technical specs of the kit and other info

Read the faqs about headlights and relays

Factory Relays and Monitoring Units

Heat Cautions for High Watt Bulbs


Why not pick up a few extra Posi-Locks and Posi-Taps with your Kit? Great for all wiring, even around the house!

And hey, we've got Powerlet stuff to keep you warm and power all your accessories.