Gary chevy technician replied 4 years ago.
Roof marker lights chevy not working.
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The roof marker lights and the amber side running lights on the flat bed haven t worked since.
The fuse for the roof mounted lights is in the under hood fuse block and is labeled int park it is a 10a fuse.
One that was a little flaky most of the diodes were out in it already.
It s in the under hood fuse box and it s a 10a fuse labelled intpark in the center area towards the right.
The roof marker lights on your 2003 chevrolet silverado 1500 hd are turned on and off with the park lights using the headlight switch.
If the fuse is good i would suspect a wiring issue inside the cap as the cause of your problem.
Turns 4 ways and brake lights all worked buy no running lights.
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It was an led marker light that had shorted out.
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The other two things on that fuse are the pto button and the light for the airbag disable switch on the dash.
Ok i ll check it.
Rollin coal jan 9 2015.