Northern tool brand wire fed gasless welder feeds wire fan work no welding?

The only things that come to mind after your checks are a spool not set in completely, a stripped spool or a spool drive shaft failure of some kind.
so...make surenthe spool is not stripped, its seated all the way and if so is the drive shaft for the spool and/or feeder pulleys all moving. If nothing is moving anywhere but you hear the actuator motors turning inside you have a warranty issue.

There are several things that could cause this:
1. The relay (contactor) that switches on the arc is not closing and it could be bad.
2. The diodes in the power supply are bad.
3. The low voltage transformer is bad.

first unscrew the tiny tip at very end of torch (can be hot)!! then try to feed wire thru handle,gently shake cable as you do helps to feed wire thru cable , if successful you have allowed the amps to get too high for the feed rate (slow) and melted the tip closed , these tips are replaceable from miller and are not expensive

Here's a few things you can check:
When gun trigger is pulled, do the drive wheels turn? If they aren't, pull the trigger again; do you hear anything within the machine (contactors closing, gas solinouds opening, any clicking, etc.) that would indicate the trigger circuit is functional?
If the drive wheels are turning, but wire isn't being pushed thru the mig gun, check for proper drive roll vs. wire size. If that is correct, check gun liner for obstructions. Flux cored wire tends to stop up a wire liner fairly quickly.

Most mig welders have reversible feed spools. There is a good chance you have the spool in the .030 wire side. Remove the spool retaining clip and flip the spool to .023 wire for example. I don't know what size wire you are using. Also there is an adjustment for the drive spool. Tighten the tensioner spring thumb screw to increase the feed tension.

check small wire on opposite end of Gun. May not be connected well

The Rossi 220bz mig welder comes set up to use gas welding, that is with the Mig electrode connected to the positive terminal, inside the machine.
To use gasless mig wleding, the mig wire must be disconnected from the positive terminal inside the machine and reconnected to the Negative terminal - inside the machine. Open both the side coveres of the welder using a phillips screwdriver. Use a 13mm spanner to undo the hex nut holding the thick copper Mig lead to the terminal named positive, then lead it through the machine to the terminal on the oppisite side of the machine, labelled negative and screw it in place there with a 13mm hex screw. Be carefull not to bump any of the many electric parts inside the machine.
If you run the Mig welder in gasless mode with positive earth and positive elecrode it will blow the household electric fuse.
If you run the Mig welder in gasless mode with negative earth and positive electrode it will work, but the end of the Mig gun tip will get very very hot and start smoking abnormally from excessive heat.
But if you take the side covers off and rewire it (takes about 10 minutes) to negative Mig Electrode, the Mig gun tip remains cool and does not overheat. You will have to cut just one white cable tie, to get an extra inch or so of free Mig cable, so the thick copper Mig lead will reach accross to the terminal on the other side of the machine named negative. Stick the earth lead at the front in the positive terminal.
I did this on my Rossi 220bz mig welder.
http://www.weldequip.com/gasless-mig-wire.htm

The other difference between gas/gasless is the ability to reverse the gun polarity which you can't do with a gasless only welder. You can get it to work but not safely and reliability could be an issue also.

Yiu can use both innershiel and solid core wire. All you need to do is inverse the polarity for the innershield wire (gasless wire) connect the gun to the ground and ground cable to positive side.

Check that your ground clamp connection to the weldment is secure (tight).
you can weld with the shielding gas, or without.
by not welding right, what exactly do you mean?