Unhook battery and take it out. Make sure it's got electrolyte past the top of the plates. If not top off with distilled water. Throw on charge on it. Hook back up and see what happens.
Should be over 12v standing after charge.
With everything off while hooking up. Do you see a spark at the terminals?
If you do. You have something draining the battery when it shouldnt.
When you crank it over have a volt meter hooked up so you can see how much the voltage drops while cranking.
Shouldnt drop lower than about 9v or the battery may be shot or the improper size.
While running the battery voltage should be about 13 to 15 volts or something is wrong with battery or it's not charging while its running.
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