I own a 2000 jeep cherokee sport. i traded trucks for this 2000 jeep cherokee sport with 96,xxx. i traded my 87 metric to long bed! yes know i screwed up!
The guy failed to tell me it was having charging issues.

The truck will turn on, an run fine. but will run until the battery dies.
New parts that have purchased
-new battery
-new computer
-alternator
i put a multi meter on the alternator and it was putting out 11.8 which means its not working,
i have had the alternator tested and it checked out good.
i don't know where to go from here. is there a fuse i missing or something? any ideas would help

 

Theres a battery temp sensor under battery see if its plug in...

The battery temperature sensor is actually inside the power module (or SMEC). It measures the air temperature as it flows through the power module, using the temperature to calculate the intake air density and target charging system voltage.
The battery temperature sensor reacts to different temperatures by producing a voltage between .04 volts and 4.96 volts DC, based on an input voltage of 5 volts DC. Because the logic module is so close to the battery, these readings can be used to estimate the temperature of the battery itself. Knowing the temperature of the battery is important because batteries are sensitive to heat, and the logic module will reduce the power sent to the battery by the alternator to prevent “cooking the battery.”
If the logic module detects a voltage outside the normal range (0.04 to 4.96 volts), it triggers a code 44 and the charging rate is set to 14.0 volts as a “safe” option. If the output of the sensor returns to the normal range, the logic module will return to normal operation and it will use the output from the sensor to adjust charging rates.
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i did see it and its very lose it does not sit in the hole. it was coming out unless the battery was onto of it would you remind swapping it out for a new one

 

Might be worth looking into

 

i just swapped to a brand new one and no luck

 

I just went through the same problem on my 98 XJ. I had the starter checked out and that was causing my battery to drain. So, since you said you had the alternator checked and it was fine I would have your starter checked. Once I changed out the starter I have not had a charging problem since.
BTW, mine was still starting fine but the starter was causing the battery to discharge. Yes a starter can cause a battery to drain while driving fine.
One other thing I forgot to mention. Did you clean all of the grounding points. Not just at the battery but all of them. That would include both battery terminals, battery to fender, oil dip stick, rear of head to the firewall and the mounting area between the starter and the engine block.

 

Having an alternator tested at a local auto parts store isn't proof that it's OK. Just went through that. Finally replaced the alternator with a new one. It works fine now....
The voltage regulator in the alternator was intermittent.

 

Pull the alternator apart and check the brushes. Or smack the alternator with a hammer. On my worn out alternators where the brushes were wore the old rusty Springs would bind and not push the brushes out until a wack. If the brushes are shot you can get the brush assembly on eBay for like 15$.

And the voltage regulator is in the computer on 92+ Cherokee

 

I'd just take the alternator back since you have a warranty. See Bill's comment- the testers are 50/50 at best.
Another thing to check is the maxi fuse that sits between the alternator and the battery.
It's inside the PDC between the two studs marked "Bat" and "Gen". If you don't measure exactly the same voltage on those two studs, the fuse is blown.