Driver's side taillight not working?

POLYGLOT82

MEMBER
2014 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
122,000 MILES

The bulb works fine (tested by putting in the other light housing). The light functions when the brakes are used, turn signal is activated and hazards are on. I changed the wiring harness to no avail. I can't figure out which fuse (or fuse box) controls the light to check it but besides that I'm not sure what else to try.

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,709 POSTS

Hi,

There is a fuse for the left-side parking lights. If the front left parking lights work, the fuse should be fine because it powers the left front and rear.

I attached a pic below, so you have a reference. Fuse 4 in the battery junction box powers the park lamp relay, brake lights, and so on. So, that can't be faulty otherwise the other lights wouldn't be working.

Power from fuse 4 goes to the trailer/parking lamp relay. I checked for a power supply from a different source than one labeled trailer, but this is the only one I see powering the rear tail lamps. The relay can't be faulty because it would cause the right side to fail too, so my first suspect is either the fuse or a broken wire.

The fuse you are looking for is the parking lamp left fuse (15 amp) in the under-hood power distribution box. See pics 2 and 3. When you check this fuse, make sure there is power to and from it. Note: it will only have power when the lights are on.

Let me know what you find.

Take care,

joe

See pics below.

Images (Click to make bigger)