Runs fine for a wile then dies battery drained

Is the check engine light on, and if it is, get it read to find out what the codes are.

come on, check the gas tank

The alternator is the issue, the battery starts the vehicle, when running the alternator run some everything. If the battery is going dead when driving then it's the alternator dying, does the. Battery light come on?

a healthy battery will take a charge and discharge and be o k -you have several things going on-the ticking noise is some kinda rely that is turning on and off probably because of low voltage-the voltage jumping around sound like the alternator is giving up and is not fully charging battery-you may also have a drain on the battery that doesn't stop when you turn the key off like an extra power amp for the radio- you can take your car to autozone or advanced auto and they will check out the charging system for free and tell you what is going on-cheers Denny

pull the spark plugs and see if water comes out of the cylinders. Disconnect the battery and turn it over by hand with the spark plugs removed.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Parasitic draw is what's happening . Have see instrument clusters cause this ,as well as module's not powering down . You need to do testing to find the problem . Watch these videos an test .
Diagnose Battery Drain Parasitic Draw Chevy Trailblazer
The Trainer 27 3 Ways Of Finding The Cause Of Key Off Battery Drain...

Does your car have a little black chip on the key?

if the battery holds the charge for a day or 2 wile you drive the car normally then you should check your alternator live the car 2 or 3 days after the battery was charged and check if it starts and run if it does run it another 2 or 3 days and see if the battery dies if it dies most likely your alternator is bad, your mechanic can test it with in 3 minutes to see if it is the alternator or the battery

are you sure the alternator is good? because it could be tricky ...The only other thing is the wire running back to battery pack to charge battery maybe disconnected

when alternator warmed up it would not put out proper amps. replaced and works fine.