Another issue for me! My 2001 Catera Sport is has been intermittently running its battery dead. It was happening once a month or so for about a year, during that time I replaced the battery and nothing changed. I ended up getting jumper cables and putting the spare battery in the trunk so I can jump it with that. I moved down to Phoenix from Flagstaff (warmer climate) and it didn't happen for a year. Then this past weekend I went out of town and left it in a parking garage. I came back it started a little hard (like the battery was dying), but it started nonetheless. I parked it at my place then unpacked, went to go get food about two hours later and the car wouldn't start. It was like it would do a half turn over. I went inside, made sure the trunk battery was charged.
The next morning I jumped it with the battery in the back and it started right away. I drove to work, turned off the car, then tried to start it and it worked. I came back out after work and it didn't start. I turned the flipped the key incase there was a contact issue, nothing changed. Jumped it and drove home.
I got home, turn it off, tried to start it and it started. I disconnected a terminal and put an amp-meter in line with the negative terminal. It was pulling 0.010 or 0.001 amps consistently. Now it sits in my garage with the negative terminal unhooked. I'll try it tomorrow morning and see if the battery is somehow draining itself. I don't think 0.010 amps is anything that should be draining a battery in a few hours.
I've taken it to a shop (last year) and paid $50 labor for them to test the battery cables. They say the cables are good.
Any ideas on what to do from here?