Whats the voltage at the battery measured with a multimeter? Heres some voltages and the % of charge left for reference. 9 times out of 10 no crank is caused by a bad or low battery.
State of Charge Voltage
100% 12.7 - 13.2
75% 12.4
50% 12.2
25% 12.0
Discharged 0 - 11.9
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