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