Sounds like it may be an earth problem. or at least part of the problem. if the earth to the chassis is lifted or high resistance the current will backfeed through the earth on other globes on the same light fitting or circuit. instead of dropping 12 volts across one filament, the voltage goes across 2 globes thereby dropping 6v across each (Hence the dim glow on each globe. i would recommend checking the earths first and see what problems are left after that. it may fix them all or show different symptoms which will make it easier to find. on the other hand it might do nothing at all. Electrons have a habit of doing strange things sometimes, even to the point of appearing to defy Ohms Law.
Cheers
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