SOURCE: headlight replacement 1998 GMC Sierra
there are two rods that slide down from the top. you have to turn to get them out of clip then pull up. once both are out then headlight can be removed.
SOURCE: Replace 2005 GMC Sierra Daytime Running Lights...
Open the hood, and in the top right and left corners of the primary headlamps you'll see two pins (L shaped) swing them out (towards the front of the truck) and lift out. This allows you to remove the upper headlamp assembly. You can then remove the lower assembly by pushing outwards on the plastic clip that is hooked into a metal clip. Once it's out you just turn the bulb to remove it.
It's much easier if you unhook the leads to the upper assembly's bulbes so you can set the whole thing aside.
SOURCE: DRL is not working
1996-99 GM trucks.There is a diode, located under the dash between the steering wheel and the radio, fastened to the round dash bar. The bolt that holds it on, threads into the top of the bar, it is near impossible to get at with a wrench. It is a finned block of (usaully black) aluminum about 2 inches squared 3 inches long. I found a easy way to get it out. Looking up you will see two tabs bent holding the diode in a bracket, bend them out of the way( you may have to bend the bracket a little aswell) and with patience the diode will slide out of the bracket, then disconect the electrical plug-in. I have found that this is the main reason for day-time driving light failure
Also, check your emergency brake pedal. Make sure it is all the way up. If it is down just one click the day time running lamps will not come on.
SOURCE: My light sensor is out on my 1999 gmc sierra and
Dont mean to be rude but last time i had this problem the driver had a piece of paper on top of sensor on dash wich is located in the center top of dash. If it is out, sorry i have never had on go out to need to replace it.
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