This is strange. I bought these led replacement bulbs for standard bayonet type like 1156 bulbs. I have a double fixture and a single typical rv fixtures. So I put the two led in the double they work just fine. I put one in the single and it doesnt work regular bulb works.. I have taken one of the working ones out and put it in the single and no go. Put the regular bulb in it and it lights right up. Maybe the center contact is not high enough ? I just dont know
