car won't start

I have more then 50k on the car... Starter usually gives signs that will give up and this one never made problems. The car worked just fine up to this break. yes, the battery cables are ok,no corrosion can be found. I saw the oil - just fine. Can it be some module responsible for the engine start ?. The knock noise come usually by low battery, happened more times with other cars. But, when i replaced it the problem is still there, nothing change. It is like the starter can not get enough power...but why?

Dave you have right, probably the battery is not enough powerful. It just gives 835 by 32F // 650 by 0F but I think it should at least try to roll over...otherwise the town car is so smart, that notice the less current and cut the entire engine. it is the straw that breaks the camel's back....Who knows. The anti - theft light is solid. Thank you for your quick answers, will try in the morning with other battery...

Yeah, in theory 650 should at least let it turn...I agree. Yet, it's the only theory that really makes sense with your concern thus far. The theft light being solid is a good thing. Don't forget that when it gets cold (as I'm sure it is in Skokie/Chicagoland right now...), the engine gets that much harder to turn. Hopefully all will clear up with a stronger battery.

. .. just back from vacation :) Solving the problem - the issue was the main cable going to the starter, nothing else. I just made new connection there and every thing is working fine. I am not loosing my trust in the town car...