Trailblazers and Envoys Offroad

Auxiliary Light Aiming


Typically, driving lights are mounted above the front bumper about 14-30 inches from the ground to provide extra high beam illumination. Driving lights can be mounted below the bumper, although they will not be as effective because the light will hit the ground sooner and reduce the range of the light.

Visual aim is made with the center of the beam hot spot 1.5 inches below the lamp center at 25 feet with the lamp facing straight forward, (see below.)


Do not use driving lights into oncoming traffic.

Driving lights should never be the only foreword light source.

Driving lights should only be used with the headlamp high beams.


There are two important issues to address when installing fog lights, the first is to minimize the amount of return glare into the drivers eyes, and the other is to minimize glare into oncoming eyes. Both of those issues must be accomplished while putting as much light as possible on the road.

These fog/foul weather light aiming instructions are suggestions taken from common practice and the S.A.E. standard J583. Some modifications to these instructions may be necessary to minimize glare.

Visual aim is made with the top of the beam 4 inches below the lamp center at 25 feet with the lamp facing straight forward. (See below.)


Only use fog lights if they are aimed properly.

Fog lights should never be the only foreword light source.

Fog lights should be used with headlamp low beams.


  • Charlie Robinson says:


    I am a proud owner of a 2003 Trailblazer. I have been working hard at transforming my Blazer into a rugged off road machine. I just happened across this site and would love to become a member or find out about any other groups for Trailblazer owners. I live in Seattle WA and have been looking for fellow off road junkies to get together with. Please let me know how I can join your group if possible and perhaps any other Northwest groups.

    Thank you!!!


    October 26, 2011 at 3:15 pm
    • JamesDowning says:

      Charlie, join up on the forum and introduce yourself. There is a lot of extra stuff on the forum, which is the main repository for all of our information. It’s a good place to locate other people in your area too.

      October 26, 2011 at 3:34 pm

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