I have a 1999 Audi A4 Quattro and the car started fine then a few hours later would not start and when I turn the key no clicking the it is a lot colder outside now that it was when it was working. I changed the starter and it still will not start or click. I am not sure what else could be wrong. Can you help?

 

Not being funny, but I'm going to assume your battery is charged? Are the connections on the battery solid? Is it an automatic or a 5 speed? If it's a manual, can you push start it?

 

What is the battery voltage?
A good battery will only have on 40% of cranking power when it is 20 degrees outside. Also what is the voltage at terminal 50 of the starter when cranking?
If you answer those 2 questions you will either have or be closer to the correct answer as to why your car does not start. Or you can keep throwing parts at your car in a attempt to find the answer.

 

The battery cables are all good all new. I have power to the starter. Just when. When trying to start no clicks or anything. It will not Push start. It did before I changed starter. It's a 5 speed

 

So how many volts at battery , at starter terminal 30 (the big wire & terminal 50 (the Small wire)????????????????????????????

It should be a number between 0 & 13 for each.

You are not answering the question , I am trying to help & all your are looking for is a magic Silver Bullet! Without checking the voltages you will be guessing & throwing more parts at your car that you do not need.
Just because something is new does not mean it is good.
NEW= Never Ever Worked!

 

I had to take the battery in to get it tested it is at 12.8 fully charged and good. the other I do not have a tester but a light tester so I can not answer that part. I can go get one if I need to.

 

Amazon.com: voltmeter

I am sure affording one is not a problem. Would be a good investment if you plan on fixing your car yourself.