Dead 7.3!!!! Please Help
So just as a precurser I had starting problems about 2 months ago and replaced by GPR which was actually cracked in half hence the hard start problem. Now we get into the real problem:
I started the truck this morning and it started great! Fast start, good battery power, no smoke, etc. I get to work with no problems and shut the truck off.
I get done with work about 10 hours later and go to start my truck. It hardly cranks and my battery gauge shows that it is on the line just above 8 which I suspect is about 10 volts. I figured I may have left a light on but no I really second guess that. I had my sister jump it and it started with much convincing. It would start for a sec and then die. While it was hooked up to the jumpers I noticed a cylinder shaped object behind the passenger side battery that was making a fast loud clicking noise.
Once it was started I unhooked the jumpers and shut the hood. I then pulled out of work watching the battery gauge and it was steady but as I accelerated harder I noticed that it was going down (ps, when I very first got it started and running the battery level appeared to be at normal level, halfway between 8 and 18). It continued going dow for about a mile until it I shut the engine off because my ABS light and Airbag light came on and my gauges started tripping out.
I let it rest for a few minutes and then jumped it again and that cylindrical shaped object was still ticking. It started and idled at normal voltage and stayed consistent until I again started moving. It lasted a bit longer this time and still continued to die. The lights and gauges lit up the same and I noticed that my headlights were dimming. My RPM gauge never died but the other gauges were spazzing out and eventually all shutoff as my voltage hit the 8 volt mark. The truck was still running but seemed to have some lag between the time I hit the gas and when it would pick up and respond. I have NOOO idea what could be the cause of this and I have no idea how to even troubleshoot the problem. Can I please please get some help. Thanks so much. I just need to get it working so I can get my baby to my sisters safely instead of a scary jeep.