Do you have a multimeter? If not, pick one up because the very first thing you need to know is how many DC volts the new battery is outputting. You'll measure red lead to positive pole and black lead to negative pole and it should be at least 12 volts DC when measured with a reasonably good meter set to DC Volts. You don't need to spend a fortune on the meter but it should be reliable. If it measures less than 12 volts, put it on a trickle charger for a few hours and measure it again with the charger disconnected. It would not be the first time I've seen a brand new battery that was faulty out of the box...
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