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How to Connect a H4 Bulb

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The H4 is a common headlight bulb found on both cars and trucks. This type of bulb has a dust cover and a spring clip that secures it to the headlight housing.

The bulb uses a single filament to provide a beam pattern. Depending on the vehicle and the socket, the light intensity and power will vary from bulb to bulb.

There are many different types of bulbs, and this is something that should be understood before purchasing a replacement bulb for your car or truck. This will help you to shop for the right bulb for your needs.

To connect a h4 bulb you will need to remove your stock headlight bulbs and unplug them from the harnesses. This is done by twisting and pulling off the base screws on each headlight bulb. You will also need to slide in the rubber dust caps that come with the LED bulbs.

Once you have your headlight bulbs removed from the stock headlight housings you can then plug the kit’s female H4 bulb socket(s) onto the new LED bulbs. Make sure to reconnect any rubber bulb shields back in position properly.

You can now connect the relays to the H4 socket’s terminals if you are using the H4 Positive Ground Kit. This is another way to get a higher output from your LED headlights.

This is not necessary if you are running the Cyclops 10.0 H4 LED bulb in your bike’s headlight housings. If you are not utilizing the Cyclops LED bulb in your bike’s headlights, this is unnecessary and a waste of time and money.

After you have connected the relays to the H4 socket’s wires, you need to run those wires through a grommet in the headlight shell and insert them into the headlight shell. This is a simple procedure and will take less than 10 minutes.

The wiring colours on your stock bike’s HI and LO beam will vary from make to make, but BMWs usually have white wires for the HI beam and yellow wires for the LO beam. You can identify these wires by looking at your old H4 socket.

Installing a h4 bulb is very easy and should only take you a few minutes to complete. However, it is important to remember to use caution when handling the new bulb and to always insert the base into the headlight housings carefully and align the base with the holes in the base plate.

Once the base has been correctly installed in your headlight, it is a good idea to put the rubber bulb shield back in place and make sure that it is not cocked or tilted to one side or the other. This will cause the headlight to be too high or too low and may affect your beam patterns.

Getting the proper height for your Cyclops H4 LED is important and will require that you remove the base from your old stock headlights, set it aside and then come back to your new Cyclops H4 LED headlight and drop the base into place.

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