Lube the four pins lightly with any oil, grease or butter. If that fixes it, ask any electrician or electrical supply for a very small tube of conductive grease. I have over 160 bulbs in our store. That fixes 90% of the outages. If you can't find the grease, stick with butter.
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Cliff Harrison
PonderosaSports.com
Horseshoe Bend, ID
American Redoubt
N43.9668 W116.1888