In many instances you can see the break in the metal strip of the fuse.
2003 gmc sierra tail lights not working.
When i checked the wires at the tail light only the wire that worked the turn signals had juice the other 3 did not.
When the filament inside the bulb breaks it cannot illuminate the gas enclosed within the glass cover.
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When i checked the wires at the tail light only the wire that worked the turn signals had juice the other 3 did not.
Electrical is not my strong point so any help would be.
Connect the light switch to a good ground with a jumper wire and press the brake pedal.
If the tester lights up your fuse is functioning fine.
It could happen due to a loose connection of the wire or the corrosion or damage of the wire ends.
Burnt out light bulbs the other reason your tail lights are not working but your headlights are maybe a blown bulb.
I would second check the fuses probably the best to start especially since its just the rear cause they are probably on the same circuit.
If the brake light turns on you have to fix the ground connection.
Its got to be a fuse if not i guess it could potentially be a bad relay somewhere in the vehicle.
I have changed the bulbs fuses checked the tail light circut board checked the headlight switch.
The brake lights turn signals reverse lights all work but the tail lights when you head lights are on do not work.
Electrical is not my strong point so any help would be.