Long story short, there is an electrical problem that partially stems from replacing the original sterio radio/CD player with an aftermarket unit. The original problem was the battery wouldn't hold a charge(also the alarm system would always activate when I reconnected the battery unless I quickly turned the key in the ignition). I was unable to fix this so I resorted to disconnecting one battery post and recharging the battery at night with a trickle charger then quickly turning the key to start the car after I reconnected the battery. This worked OK but the car began running solely on the battery and sometimes would stall and die from lack of electrical power. I replaced the alternator and this fixed the problem for a while, (the battery was getting re-charged with the new alternator). Now the car will not start, even with a hot battery or a jumper battery attached. The instrument lights all come on when the battery is first attached and when I turn the key everything appears fairly normal except the horn doesn't honk (the alarm system is not working now) and the starter doesn't turn the engine over. The instrument indicator lights just dim slightly when I try to engage the starter, but the starter doesn't crank. I ran a quick check of the alternator with the B&D battery charger and it said Fault. What should I do to diagnose or fix