Battery issues?

Asked by Apr 25, 2018 at 10:42 AM about the 2000 Oldsmobile Alero

Question type: Maintenance & Repair

This is going to be long and I apologize but I could
use help period started off whenever I would be
driving my 2000 Alero the car would shut off
everything no power steering no power brakes I'll
wait about 20 30 minutes later and then start back
up only for it to do it again it progressively got
worse and I was told it was probably the fuel pump
so I replace a fuel pump myself which is my first
attempt doing so. Whenever I did it the first time I
did it wrong because I didn't put put it in the correct
way as far as it needed to be turn a quarter inch
more if that makes sense very but I didn't know
that at the time so when try starting it just didn't do
anything so I dropped the tank again and put it in
the the right way and I feel confident about it so I
went to turn the key over and my battery just
completely gone it's toast.. here's where it gets
interesting. I did a reading and my battery reads
11.86 without the terminals being on there but they
whenever I hook up the positive is still reads the
same but then I hook up the negative and it drops
down and fluctuates between 3 and 5 volts and it
doesn't matter which of the ground cables I use. So
I tried jumping it and the reading was 13.96 with
the jumper cables on there but once I have put on
the negative ground wires it goes and fluctuates
between 3 and 5 again.. so I'm thinking it's a bad
cell in the battery but I don't know how or why it
happened and if it was something that I did with
the fuel pump.any ideas would be helpful..thanks

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