DIY Guide to Install HID lights Using Relay Harness Wiring

This step-by-step guide will help people who want to install their HID conversion kit directly to the vehicle’s battery using a relay harness wiring. So, without wasting any more time, let the fun begin.

Items Required

You will need the following items prior to installing the HID kit using relay harness wiring:

HID Kit (2 ballasts and 2 HID bulbs; ensure the HID Kit is compatible with your car before purchasing)
Relay Harness
Pliers
Wire cutters
TORX #20 driver
Electrical tape
Zip ties
470 uF 35V capacitor (available at any electronic retail store for about $1.29)

Installation Steps

Step 1: Cut off Gourmet Wires

Cut off the gourmet wires using a wire cutter. Be careful not to cut off the main wires.
You will be left with just two wires as shown in the picture below.
The gourmet wires will not be required since you will be not be connecting the HID kit to the car’s OEM wire harness. The wire on the left will connect to the ballasts while the wire to the right plugs in to the relay wire.

Step 2: Install HID Bulbs

You may want to skip to Step 4 if the HID kit is already installed in your vehicle. Find the location of the original bulb in your car. Remove the original bulb from each headlight by turning it in counter-clockwise direction and pulling it out of the headlight socket. Now, insert the HID bulb to headlight bulb socket

Step 3: Mount the HID ballasts

Find a suitable place inside your vehicle to mount the HID ballast. The ideal place is to put it behind the headlight housing.
Secure the HID ballast in place with the zip ties, and put double side tape to hold it in place. Make sure the HID ballast is not lose.

Step 4: Install the Capacitor

The relay harness prevents the HID power problems by providing power to the HID kit directly via the vehicle battery. Before connecting the relay to the HID kit wires, you should install a 470uF capacitor to the relay harness. You should be careful in placing the correct terminals of the capacitor to the harness as putting it incorrectly will make you burn the capacitor when connecting to the battery.

Remove the relay from the harness. Now simply plug in the negative (-) side of the capacitor (side of the capacitor that has a stripe) to the negative terminal of the relay and positive (+) side to the positive terminal of the relay. Re-install the relay and wrap it with an electric tap to prevent moisture from reaching the inside.

Step 5

Find a suitable place where you would like to secure the relay. A good place is under the fuse box near the car headlight. Secure the harness in place with the help of a zip tie.

Step 6

Attach the ground (black) wire to the chassis ground wire.

Step 7

Now open the small red box that is located next to the fuse box. Slide the power (red) wire of the relay under the box and fix it onto the post.

Step 8

Now connect the long black plastic cable of the relay harness to the two HID ballasts, and connect both ballasts wires to the HID bulbs.

Step 9

Finally, connect relay harness wire to the OEM factory light bulb plug. Make sure that you plug the wire of the harness correctly to the HID bulbs or you could damage your HID kit. Black goes to Black, and Red to White.

Step 10

Now, turn on the light and check to make sure they are working correctly.

Step 11

At last, walk towards the fridge. Open the fridge door with your preferred hand, and grab a bottle of coke to celebrate.

Headlight restoration returns your HID headlights to original condition. The process fixes the surface damage and restores visibility of your headlight lenses. Restoration process can restore even the most serious hazing, yellowing and abrasion.

If damage isn’t that great, you may be able to fix the problem with simple polish of headlight plastic casing. You can test a small area to see if simple plastic polish can do the trick. Dab a soft cloth with tartar control toothpaste and see if the plastic casing becomes clean. If the test area improves, you may not want to proceed further. Just polish the whole plastic casing from outside with a plastic polishing material. You should avoid using household glass cleaning products that contain ammonia on the headlight plastic because it can cause the plastic to turn yellow.

If simple plastic polish doesn’t clean hazing and yellowing of headlight, you may want to restore it using a fine sand paper and re-polish it to make it perfectly clean. You will need the following supplies for this purpose;

Rubbing alcohol
Bucket of soap water
Plastic polish
Sand paper (600 or 2000 grit)
Sanding block
Latex gloves
Painter’s masking tape
Polishing towels
Wool polishing pad or foam

STEP 1

While wearing latex gloves carefully take out the HID bulb from the socket and clean it using a rubbing alcohol. Just make sure the bulb is cold before cleaning it.

STEP 2

Now clean off the head light lens using a soft cloth by dipping it in a bucket of soap water.

STEP 3

Mask around the headlight lens from outside using a painter’s masking tape. This will ensure that the paint of the car remains protected.

STEP 4

Slightly wet the headlight lens and then examine how much damage is done to each headlight lens. If the headlight is slightly opaque then you have to polish them using 2000 grit sandpaper. However, a completely opaque lens would require polish with a 600 grit sandpaper and progressing it to 1200 and then 2000 grit sandpaper.

As you work through sanding headlight lens, sanding water will turn white. The reason is that sanding process removes damaged layer from headlight lens. You should try to keep sanding paper clear as you work through sanding the lens. Keep it sanding until the lens’ surface of is completely smooth.

STEP 5

Now re-glaze headlight lens with a dab of plastic polish. You should apply several dabs of polish to the polishing pad and begin polishing it using wool or foam. Stop polishing it once it becomes clear.