I have no power to the starter solenoid on our 2003 3.8 town and country, It clicks at the relay I have power at the starter and the battery is new , I have cleaned the connections at fuses and relays vehicle will not turn over and start

Check for a loose or corroded ground wire at the battery or from the engine to frame.

You could have a bad fuse, or, the ECM may be bad. the "ECM" is the computer.

Starter motor solenoid replaced or replace bushes.

could be starter relay in fuse box under hood

check for proper current from alternator more than13.5 volts that should do it if not check active codes if its not stolen

Its possible that the Starter is bad. But check your Starter relay first. If you use jumper cables and bridge the main cable on one side of the Relay to the opposite side, and it works, the Relay is bad. About $15 for the part.

When you test for Battery voltage, hook the POS end of your charger to the Battery side of the Relay. If your Battery post is dirty, you may have 12 or more Volts at the Battery, but nothing at the Solenoid. Then you just need to clean the cable and try it.

If you get the Van to run, you can always go to Autozone or Oreillys and have them do a Starter draw test. Then you will be confident about the Starters' condition and you will not have to remove it for nothing. The tests are free as well as them using a scanner on your vehicle.

When you turn the switch over, does the lights dim or flicker? If that's the case then the battery don't have the power it needs to turn the engine over, so it could be the cables and post need cleaning, or the solenoid for the starter is bad. The description you give with the clicking sound, gives me the thought of starter solenoid, but always do the easiest and cheapest. "clean those terminals and post first"

has it got an immobiliser / if so there is a fault there. If not an ignition switch itself.

check the starter again by banging on it with a hammer it could be defective starter if not check your crank shaft position sensor

could be your solenoid. Feeds power to the starter motor like a relay only bigger and louder. Normally bolted to the starter motor