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6.3V is the most common dial light voltage. If the bulb has resistance that is not infinity follow the wire back checking voltage between it and ground(if that is what the outside of the socket is connected to) for something more than a volt. And if you find fillament voltage then there is an open circuit somewhere between there and the bulb.
Correct me if I said anything wrong. All dial light failure I've deal with were burnt out bulbs.
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