Bought new 800CCA battery to replace old drained battery, one day later the new battery drained

Asked by Nov 20, 2016 at 09:38 PM about the 1996 Chevrolet Tahoe

Question type: Maintenance & Repair

I tested my battery a couple months ago and it said that the battery was
just about on it's last leg. So it was no surprise when I came to my truck a
couple days ago and the battery was completely dead. Knowing it was on
its last leg, i jumpstarted it to a store and bought a new 800CCA battery.
For the first day or two, my truck started up with zero issues, it maintained
around 14-15 volts when running, etc. Then today, I go to start it and the
battery is completely dead. I have zero idea where to look at first, but these
points are for certain:

-I tested the voltage of the old battery when it was running (since the guy at
the store thought it may have been an alternator), and the alternator was
putting out low numbers (13.8V total). Knowing that my battery was on its
last leg, he recommended that I toss in a new battery first and then test the
alternator output to determine what my issue was. After the new battery, it
tested at about 15.2V total and stayed very consistent.
-There was ONE instance when I went to start it as it was getting jumped,
where there would be a constant clicking noise when I turned the key.
Some people have been pointing to a starter issue, but those seem to be
people who are having consistent clicking noises. For me this happened
once out of the 5 total times ive had to jump it.

So I dont know what this could be. If it can possibly be a faulty connection
that occasionally drains the battery, or is there something in the system
that's causing my battery to drain? Plus, I dont know my truck that well to
know where all of the connections are, and where to begin looking

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