Car wouldnt start........what say the Brotherhood?

[Z51JEFF]

I stopped by my brothers house earlier today,got ready to leave and the car wouldnt start.Batteries maybe 6 months old,Alt is charging,turn key and the Security light goes out but no start.Im thinking either clutch safety switch or the starter gettin funny.I jumped it with a battery charger and it starts right up.Drove the car home,put it in the garage and the car starts right up.I drove the car for a few miles yesterday but other than a short drive every other week dont really drive it that much.Why would the car start with a jump from the battery charger?If the starter is acting up would the extra juice from the jump jolt the starter to work?I thought the VATS might be acting up but from what Ive read if the Security light goes out when the key is turned to start the Security light will go out.Id like to think this was a freak occurrence but would like to find out whats goin on here.What say the Brotherhood?