I eventually figure out that this bulb requires +12v on both of the contacts (within the black disc on the right side within this picture), and ground on the metal base. This type of bulb is designed for automotive applications where two levels of brightness are required; like a tail light/brakelight.
The bulb that was in the fixture prior to me getting the boat required +12 on one othe the contacts and ground on the other.
Such a simple thing seemed very perplexing at the time.
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