Leave the charger on it for a while then try it. Sounds like you have a parasitic load somewhere. FWIW there's nothing wrong with a properly maintained 6v system IMHO. Get a full charge on the battery, pull one of the cables and check for current flow between the cable you pulled and the battery with everything turned off. If you find current flow you get to play detective.


Save a life, adopt a senior shelter pet.
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Name your dog Naked so you can walk Naked in the park.