Radio I just bought a 2000 Navigator, and my AM/FM radio is only picking up a few stations, and then they seem to fade out to static. It does not have a standard antena, it has an internal one...

Most likely the antenna lead has come unhooked from the back of the radio. AM stations will pick up with the internal working of the radio, but FM stations have to have a working antenna to work. Also make the antenna is tight to the vehicle .

Check the connection from the radio to the antenna.May not be plugged in.

The alternator is most likly the problem. If it was ok before and you had the alternator replaced the problem should be the new alternator. The above answer is if static is your problem. If you can not pick up stations there is a good chance that you have a antenna problem.

check your antenna

the operator guide in the glove box , covers time set.
all radios do that.
and if not normal, the antenna is broken or fell off the rear of radio.

if got static switch to FM ,
many AM stations, broadcase to am and fm same content.
so use FM. its static free. (by design) but does fade sooner.
you can in fact hear AM station 12,000 miles away it night
called super stations, 50,000 watt stations. ive done this many time.

did you try another car, in same spot , and same station?
are you in under ground parking?

your probably in a bad place and you wont pick up a signal like if your out of cell phone range, except your probably out of radio range for am stations.

i would get the alternator checked, sounds like its leaking ac current which can also kill the battery

ckek your antena wire behind glove box if its ok problem in radio

This sounds to me like the antenna wire may have become loose in the back of the radio. It just took a few weeks for it to become free. :) If you can maneuver your arm behind it, you should be able to push the connector back into the hole in the back of the radio. But the safest and most practical way to do it is to remove the radio from the dash and plug it in that way. :)

I hope this helps! Let me know if I can be of further assistance. :)

if you are receiving stations on the higher frequencies then your radio is the problem and not your antenna or anything else