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I have a 2004 Toyota Camry, and the taillight is not lighting up when the headlights are turned on. This is happening equally on both the left and right sides. When I pulled the old bulb out, I noticed some acid buildup on the end. We tried cleaning that out as best as we could (it's a small bulb and hard to get into the connector) but still the light will not turn on.

Any idea what the problem could be? Do I need to replace the whole connector?

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    Have you checked the fuse? Does it work with just the parking lights on? Have you checked the connector with a multimeter to see if there is any power there when you turn the lights on?
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Apr 23, 2017 at 22:59
  • Not a multimeter but I did have a basic tester and didn't an indication... We were trying to check fuses, but didn't see one labeled explicitly. We did try to check several fuses.
    – Brian Mains
    Commented Apr 24, 2017 at 2:08
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    Make sure the contacts are clean then re-test for a supply. If still not working then check the fuses and the switch.
    – Solar Mike
    Commented Apr 24, 2017 at 5:37
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    Did the problem begin simultaneously on both sides (left and right taillights?) If so, I would stop looking at the bulbs and their contacts and start troubleshooting at the fusebox.
    – Tedwin
    Commented Apr 26, 2017 at 4:05

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Check the fuse. If it still good, you will have to check to make sure it has a good ground and that no wires are broken.

Without a multimeter and schematics, its going to be harder to find your issue. By basic tester, do you mean test light?

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  • Google Image can help with fusebox layouts and help with find where components are located
    – Chuck
    Commented Apr 26, 2017 at 3:48
  • FYI; you can edit your own questions and answers, rather than commenting on them to add details.
    – CharlieRB
    Commented Apr 26, 2017 at 12:18

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