With or without solar, you should be able to run the lights for a whole lot more than 5 minutes on a fully charged battery. I’d start there. Take it to Advance Auto and have it load tested.
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2007/21 TM 3326 (Pride of the Fleet)
2000 2720SL (Rebuild Project)
2002 2619 (Parts TM)
SMARTER THAN GOOGLE!
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