2000 Kia Sephia short in electrical system?

It has been at places like pep boys where they are testing the charging system.

So far I have had the battery replaced 5 times in 6 years and all by different places. One from a mechanic, one from pep boys, one from goodyear, etc. Everytime I take it in with a problem they want to replace it again. The new starter is barely 5 years old, same goes for the original when I had it replaced.

The problem seemed to go away for a short time every time I get something replaced and then it comes right back, especially in the winter. I no sooner had the battery replaced at pep boys last winter when my car wouldn't start less than a month later after it dropped below freezing. Then, when I took it to a mechanic, because it wouldn't start, he said I needed a new battery, not realizing the one I had was less than a month old. This same scenario is happening pretty much every winter.

Also, it takes a long time to jump my car when it drops below freezing. I bought one of those batteries with cables attached last winter out of fear of being stranded and it wouldn't even work. In fact the thing lost most of its charge before I even used it, even though it was less than a month old and had been fully charged before I put it in my trunk.

How can I figure out which part of the charging system it is, if that is the problem?.I'm tired of chasing this problem around.

I drive it everyday. It won't start, in the morning, after sitting overnight in freezing temperatures. However, on at least one occassion, after not starting initially, it started after I let it sit in the sun and the temperature warmed up a little.

It is a top post battery. My roommate is an electrical engineer so he will be helping me also.

After sitting 2 1/2 - 3 hours the voltage reading with the engine off was : 12.88v
after running 30 seconds: 14.13v
after turning on blower and headlights:13.7

Okay, since I sometimes get a hesitation if I drive the car for a while, turn it off for a short period, then try to restart it, my roomie and I are going to drive it around right now. He will take readings after we stop, before we start, at the start and after the start and report back. Hopefully, it will act up because I don't want to wait until it is below freezing to figure out what is wrong.

Hi this is Nik, the roommate :). We drove the car for 10 minutes (headlights on since it's dusk here), pulled over in a parking lot, turned off the engine, sat for a couple of minutes, and re-started. During the re-start, it seems like it doesn't want to turn over. The sequence goes like this:
1. Turn the key
2. It makes a partial rotation sound like it -almost- turns over.
3. It pauses for a second
4. Then it turns over.

We drove back home, parked, turned off the engine, tried the re-start and it did exactly the same thing. When the car sits for about 3 hours, however, it starts more easily. I wonder what causes the difference between starting after we've just driven it vs. After it's been sitting for a few hours.

Here are the voltage readings we took on this test:
After driving, turning engine off, & waiting 2 minutes: 13.1v
During the tough cranking process: 10.6v
After start: 13.9v

Any idea why it's having a hard time turning over?

Okay, so before I drop $300 on third starter or, $100 on a seventh battery can you tell me if there would be a reason that my car is eating batteries and starters or, alternately, how I can test the starter or, if there is a way to rule out the battery? Thanks. : )

We did the tests on the posts, but we'll try the clamps tomorrow and get back to you. What exactly are we looking for, to see if the connection to the battery is bad? At this point nothing is corroded.

We just took the readings on the clamps, and they are the same, i.E.
When the car has been sitting, it starts pretty much ok.
Run the car for 5-10 min.
Turn it off.
Wait about 2 min.
Check voltage: about 13v
Turn the key, and it makes one short rev, then a pause, then it turns over with some difficulty.
During the difficult start, the voltage dips to 10.5v then goes up to 14 once the engine starts.
Note: In the winter, when it has been sitting overnight in freezing temp, it will not start at all unless we jump it.
Why do you think it behaves this way? In winter, it won't start when it sits. In summer, it's ok when it sits, but has a hard time re-starting.
The starter was replaced about 4 years ago, and the battery is brand new. If the starter is bad, do you have any idea why the car would be eating starters & batteries?