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· Ace Tuner
4,173 Posts
The filament in a bulb can break then temporally fall back in place. It could fool a continuity test because of that. Possible, not usually probable but it's why I start troubleshooting this type of thing using a new bulb. It's quick, simple, cheap and generally a reliable way to start your search for the problem. The worst that can happen is you end up with an extra bulb but you will have eliminated the absolute most common problem when a light doesn't light, the bulb.
There is no disgrace in first trying what is easy and cheap...
As others said, when you see rusted contacts in the socket you gotta do something about that. After you fix that, see if your new bulb works.

The other guys got you covered if it goes farther than just a bulb.

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