I'll take a look into replacing the 8 guage wire, too.

 

I know this is not good for the alternator, but it is similar to putting a load on it. Start the truck, disconnect the negative side of the battery cable, and see if the trucks still runs. If it runs, your alternator is probably alright. Running your truck with a bad battery will cause the alternator to work too hard and ultimately fail.

It sounds to me like it is a battery or the voltage regulator. Unfortunately, the voltage regulators are inside the alternator and I (think) you must replace the whole alternator when the regulator fails. If the alternator doesn't know how much voltage to supply the chargring system with, then you can undercharge, overcharge, or constantly change how much voltage goes to the charging system/battery.

If your truck runs fine with a new battery for more than a week, I would say its the battery. If the problem persist and the enw battery goes dead in a week or two, then it is probably the alternator.

 

I dont literally mean inside the battery i meant off the battery. My post was starting to break off and my truck did the same thing. goodluck

 

I heard not to do this on the NBS trucks because it could fry the pcm.

 

look at this also...the little ground wire that goes to the body from the neg terminal...check the block ground too...on side mount batts you CAN screw it in too far and bust out the terminal on the inside, look there...its a ground or regulator problem...easiest fix is new batt, new alt, new cables, & check all grounds

and the absolute best batt cables in the world are 2ga welding cables with copper ends you sweat on...its not that hard or expensive but will carry 300 amps for 100 yds...if you run your batt in the back do both pos & neg to the front...power your MSD box both pos & neg to them directly...never have a pop in your nitrous or a prob with low voltage to fire the box

 

Yes. DO NOT unhook the negative cable while the truck is running. You will mess up the electronics.