If I had a dollar for every GM truck I see daily with one DRL burnt out!!
Here's the GM bulletin for the DRL's. I couldn't find the 4114K's when I needed some, so I installed 4157K's, & I haven't burned one out in over 2 years. It might have something to do that I never drive with DRL's on, always low beams.
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Bulletin No.: 00-08-42-010A
Date: June 20, 2003
INFORMATION
Subject:
Daytime Running Lamp (DRL) Bulb Replacement
Models:
2002-2003 Cadillac Escalade, Escalade EXT
2003 Cadillac Escalade ESV
1999-2003 Chevrolet Silverado Pickup Models
2000-2003 Chevrolet Tahoe, Suburban
2002-2003 Chevrolet Avalanche
1999-2003 GMC Sierra Pickup Models
2000-2003 GMC Yukon, Yukon XL
2001-2003 GMC Denali, Denali XL
Supercede:
This bulletin is being revised to add model information and to announce availability of new DRL bulb part number.
Please discard Corporate Bulletin Number 00-08-42-010 (Section 08 - Body and Accessories).
A new 14 volt DRL bulb, PIN 15199562 (trade bulb # 4114K), is now available for use whenever a DRL lamp bulb on the above listed vehicles requires replacement. This more robust, higher voltage DRL bulb replaces P/N 1999482 (trade bulb #.4157K). These bulbs should be replaced in pairs for customer satisfaction.