1990 Lincoln Continental wont start

Thank you jdl123 for your response,
I replaced the solenoid under the hood next to the battery. I can hear the starter solenoid, if I have that right, its where the fins come out to start but can not hear the starter rotate, I have enough juice at that point going to the starter that if I touch a wrench on the hot side of the starter to the frame I think I could weld.

I appreciate your clearification on the solenoid and the relay, I replaced the relay then and I will try and test the black wire on the starter solenoid which is on top of the starter. My question is how do I do that. I have an ohm meter and an electrical tester.
What should I be looking for in terms of amps or whatever measurement I need?

I will try this tonight when I get home from work around 6 pm central time.

Sorry to intervene, I was reading all of your Posts on this subject. I have been having a similar problem. I have a question to all the participants, in regards to this subject. My '90-Continental has a similar problem, it just started recently. I have replaced with the last 3 weeks, the Alternator, the Voltage Regulator, and the Battery. All were tested as faulty.
But, this problem started Thursday (06/04/2009), when I noticed that after driving awhile, after the car is warm, it would not start immediately, or Crank. The Dashboard lights up, but there is no Crank (turn-over), it is hard to determine whether the Starter is engaging, or whether any relay has been energized. But, after a few minutes, or an hour, the car will start without any problem; there is no specific time limit. It starts fine when the car is cold, but all indications show, that the problem only appears after the car has warmed up. My question is this: is the problem with the Start Relay, or a Starter Relay, or a Starter Interrupt Relay, or some other unit that Ford has failed to identify, or calls something else? I only have a Chilton manual; it does not have a thorough schematic of the engine bay components.
Is the Starter relay, the unit located near the battery, that has a cylindrical shape body, and has cables from the battery, and other devices attached to it.
What other relays could affect, or contribute to this problem. I would appreciate any feedback, and advise.
Ps: I can crank the car up in Neutral w/o any problem, when it does crank. Is there other Relays that are mounted in hidden places, such as in the Inner fender well, that I should be aware of? I suspect that my problem is with in this area of operation, my vehicle is not equipped with an anti-theft device, so that is ruled out. It could be a PCM Relay, but I am not sure if this model year is equipped with such a device. Anyone have any schematics, or layout of engine bay.
Thank You in Advance. == Alfredo