about the only thing that you haven't mentioned that could be happening (barring something malfunctioning) is the battery charger maybe shifting from float to absorb mode or absorb or bulk charge mode. Either shift could result in a little more umph available to your dc lights.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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