Tail lights not working on right hand side

Start with the ground wires for the sockets. Fastest way to tell if the ground is bad is with voltage measurements. Use a test light to back-probe the wires for one of the non-working lights. Turn the tail lights and turn signal on, then poke the test light's probe through the rubber seals where the wires go into the socket. You should find steady 12 volts on one of them, pulsing 12 volts on a second wire, and 0 volts on the last one. If the ground wire is broken, the test light will light up dimly on that wire, and the dead bulb will also light up very dimly.

Hello,

It sounds like the headlight switch is bad but to be sure here is a guide and the tail light wiring diagrams so you can see how the system works and which wires to test for power.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

. But I may be able to get you a wire diagram from "mitchell i" of the exterior lighting

i need more specific info. Like the "exact" nomenclature of your truck and the engine size. Any other surprises like drl (daylight running lights) etc. Etc.

Sometimes there are hundreds of diagrams for each vehicle, being specific helps me find the correct one

the "mitchell i" diagrams show locations of components (like fuses and fusible links)

a diagram might help you narrow down the problem, they are darn ez to read!

I work until about 1800 hrs e.S.T. Tomorrow, so I won't be able to look it up. Unless you respond fast tonight, before I hit the sack!

The medic

All righty then

needed more info. Probably woulda took longer than doing this

i got you 6 diagrams. You will only use 3. The correct ones for your truck

"drl" is daylight running lights

composite is plastic headlights. The ones that get all hazed over in the sun

sealed beam is the "real glass headlights". Like I grew up on

diagram:

1) exterior lamps---1 of 2 (keeper)
2) exterior lamps---2 of 2 (keeper)

take your pick on these---only one is you:

3) headlights composite w/ drl
4) headlights composite w/o drl
5) headlights sealed beam w/ drl
6) headlights sealed beam w/o drl

lemme know that these aided in your fix!

The medic

Nice work, we are here to help, please use 2CarPros anytime.

First things first, check the fuses, as the tailights would be affected if one blows out, dont go into too far of trouble shooting to find out its a fuse.

Seems I have to sorta be the last to sign off---i keep getting notified

see you. Maybe not too soon!

The medic

Where are the brown and black wires, and do they come from the same connector and harness as the other lights?

Sounds to me you got a bad brake light switch, Its located near the brake pedal, You cant miss it.

Good Luck.

I would check for power at the headlight switch with a test light to be sure all is ok there. Also test for power to the dimmer for the dash lights.