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I know it's not the bulb or the ballast (it's a starterless ballast), I've swapped bulbs to a different unit in same circuit, the bulb works in both of them but both don't work at the same time, I've even tried a different bulb in the same connections, only one works at once and not always the same one, no clue here, any ideas?

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    Often the carriers that the end of the bulbs fit in are faulty. Either the small tabs get bent or a wire comes loose. Check those.
    – RMDman
    Commented Mar 16 at 15:05
  • Don't think it's that as both of the individual units work, just not at the same time Commented Mar 16 at 19:42
  • Are these the standard 4 foot fluorescent fixtures? If so, just change out the fixture. Or better change to the new LED fixtures.
    – RMDman
    Commented Mar 16 at 21:52
  • Six foot fittings, might be an option, just more hassle if it's not needed Commented Mar 17 at 17:35

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