I had a similar problem with my Impala spent days trying to figure it out alarm,battery, stater, was goin crazy. The car had a side post repair kit installed that when you moved things around a bit the car would start right up.
Loose connection. that is what this sounds like something that you have check many times but it is there. This is very hard to find becouse sometimes it all works good but hit a bump and there it does it again. Try to add a second ground to the motor also the starter might have a loose connection,sometimes you make the connections and then you install it and it loosens up becouse you moved it.
The fact that you move things around and sometimes it works it is the samething that happen to me. Next time just use a meter or test light to check wiring.
put a second wire going to the stater solenoid put a push start switch and next time it does not start see if by activating the second switch it turns over.
It could be you ingition switch.
Good luck.
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