Ok i ll check it.
Roof marker lights chevy not working.
The fuse for the roof mounted lights is in the under hood fuse block and is labeled int park it is a 10a fuse.
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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.
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.
If the fuse is good i would suspect a wiring issue inside the cap as the cause of your problem.
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It was an led marker light that had shorted out.
Rollin coal jan 9 2015.
As such chevrolet silverado hd and gmc sierra hd trucks in california cannot be equipped with the amber roof marker lights rpo code u01 which are typically a 55 option.
Turns 4 ways and brake lights all worked buy no running lights.
The roof marker lights on your 2003 chevrolet silverado 1500 hd are turned on and off with the park lights using the headlight switch.
Gary chevy technician replied 4 years ago.