My car keep going dead its a 2002 lincoln ls,with new battery new alternator,it start with the radio then lights,then the car goes out

check and test connections and for parasite drain

How much is this going to cost? ????? Without testing to find out what the problem is , no idea . Your best bet , take it to a qualified repair shop an have it diagnosed .

Not 100% sure what is being asked, but do any lights come on after putting key in ignition? Or radio or any other thing that draws electrical current? If none of these things happen, you probably have either a dead battery or a battery cable grounding issue.

Sometimes it is something simple. There is a plastic plug-in connection for the Alternator. What happens is the metal contacts ride up inside the plastic and fail to make a secure contact on the metal post inside the Alternator.

Some models have a fuse in the Alternator wires and some report chaffing that breaks the fuse.

If you start with a charged battery and it ends up dead, you still have a short which is not fused.

You need someone to do a comprehensive Electric test. Except for the "stay alive" circuits like clock, alarm system, and computer brain, everything should stay off when it is shut off.

This means that the 2 power types- plus and minus, are always separate until they are switched ON. When you test, you simply go to each fuse or circuit and see whether there is a connection.

Your biggest lines are called fusible links. If they are out, you will not have power to what they attach to. Relays can also cause your problems but are harder to check.

There is no universal answer to your problem. There are trends of problem parts, someone may also contribute this in another post.

The low battery can cause this, the battery must be fully charged to properly test the alternator. Testing with an inadequately charged battery can lead to the replacement of a perfectly good alternator. Know more diagnostic tools from http://www.obd2express.co.uk

Have you had the system checked to see if altenator is charging? A bad ground connection can cause a no charge or low charge condition.I would take car to parts store and have them test the whole system.

if u have ur code to reset the radio use it if not notify dealer for radio code to reset when battery goes dead radio thinks its being stolen and goes into anti theft mode

pull the radio fuse out to see if the battery hold then check your radio/cd player for defects

Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.

when you replaced the battery it was very possible that you may have blown a fuse. Check your fuses for your radio and your cig lighter.