Tools and supplies needed:
Basic hand tools to remove headlight assemblies from your vehicle
Zip Ties and/or double sided tape to secure Ballasts or Drivers
Hid/LED kit of your choice.
First you remove the headlights from your vehicle to access the bulbs on it. On GMT400 trucks the headlights are secured by two long bolts that are accessible from the top of the grill shell. On the Chevy Trailblazer like the truck in this how to there are two long tabs you access from the top of the headlight and pull upwards to release the headlight assembly from the core support. Once the headlight is removed you will need to locate somewhere to attach the Ballast/Driver where it has full reach to plug into the trucks harness. I originally had tried to do this by attaching the drivers to the back of the headlights but that didnt work as i soon found out so i wound up zip tying the drivers to the plastic support section behind each headlight as shown in the pic below.
Once you have established your final mounting place for the ballasts/drivers move onward to installing the bulbs in the headlights. At this stage it is literally a matter of twist the old bulb out and replace it with the new one. Then this is followed by re-installing the Headlight onto your vehicle and plugging in all the wiring. You may end up having to reaim your headlights after this due to the fact you now have much brighter lighting on your vehicle.
Added steps for those who wish to use a Relay harness along with the above:
Remove grille/grille shell assembly from vehicle
Route harness so that the relays and connection points for battery and ground are near the battery then place rest of harness out of harms way from hot or moving parts.
Zip tie your harness into place to make sure it is secure
Connect the imput plug (female plug near the relays) to the headlight nearest it. (Example: on drivers headlight in GMT360 vehicles and on passenger headlight on GMT400 vehicles)
Connect harness to ballasts/drivers
Reassemble front end of vehicle
Enjoy the increased output of your lights.
I will update this thread further once i work on another HID install in the near future. Plus i will also dig up pics from when i installed the Relay harness on my old 1 ton.
Edited by Darkrider, 09 March 2014 - 02:12 PM.