While replacing my Blower Motor Resistor on a 2006 Nissan Altima I found the connector plug burnt. Does this mean the Motor itself is bad and how difficult is it to replace the connector?

I suggest you find your fuse/ relay center check fuses and try new relay, I think the relay is 75% at fault most of the time.
Blazerk from Altima forum suggest
Back probe the blower motor Blue/Yellow circuit and tap it to ground, if that doesn't make the blower operate, the blower motor/power transistor assembly is bad. When the blower motor does operate while grounding that circuit, the climate control panel may be faulty, repeat the test from the connector at the control panel to verify the wiring is not damaged. Also, When verifying voltage, Use the power and ground wires to the blower motor. Other grounds may give you faulty readings.
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2000 2003 Nissan Maxima Blower Motor Amplifier Resistor Replacement...

found this helpful answer from nissan mechanic on JustAnswer com

Blower motor resistor is bad common issue with sentras, best to have a qualified Nissan tech replace it, due to the location of resistor

Hi Tina,could be your blower motor resistor,it's located next to the blower,2 screws hold it on,remove electrical connector first,take to Autozone and get a new one,if it doesn't fix,they will take back and refund your money Tina.here's a link to the resistor Tina. Duralast Heater Blower Motor Resistor JA1219 at AutoZone com Here's a link showing you the resistor Tina. Repair Guides Blower Motor Removal Installation AutoZone com

Your blower motor resistor is bad,it's mounted next to blower motor.,remove connector and 2 screws and take to Autozone and match up with new one.Here's a link to it. Repair Guides Blower Motor Removal Installation AutoZone com

Before removing the heater switch on this 2006 citroen hdi I would first have the blower motor checked and the most common reason for this and other blower problems would be the blower resistor.

Your blower works on and off at times, first locate the blower motor and the resistor. the blower motor is located on the heater box, look under the pass/side of the dash, you may have to remove under dash cover to see blower.
When you have located the blower now look to the side on the heater box, there you will see a connector plug, it plugs into a connection on the heater box, this will be the resistor, the resistor slides into heater box and the end of it bolts to box to hold it in place and then the connector plugs into it, if you can not locate it then follow wires that plug into blower , follow wires back they will lead you to resistor,
next time blower does not work wiggle connector to resistor and see if blower turns on, if it does then resistor is the problem. also unplug resistor plug at resistor and check for any burning of connectors at plug and inside resistor.

I would bet its a bad resistor or the plug is brunt due to high draw from bad connections, if plug has burn damage to connectors then replace the plug along with resistor.

Check the direct connection to the blower motor. Check the fuse. Sometimes you can try to put it on high and try hitting the blower motor to see if turns on. It may also be the blower switch or the blower itself.

Change the blower motor itself. Probably, by your description, the blower motor burnt out the resistor and overheated the plug.

There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement

It's behind the glove compartment. I had to remove about eight screws to pull of the glove compartment door and glove compartment molded plastic trim. If you are looking for the blower motor resistor. I found it. The blower motor is the roundish part on the far left hand side of the glove compartment opening. Out of the bottom of the blower motor are four wires in a common cable with a connector at the end. Disconnect this common cable connector. It is connected to the blower motor resistor with two screws. It will look like you are removing a connector, but the back side of this part has a what looks like a fin cooler. That part in your hands is the resistor (really) The part number will be on the connector P/N 27150 1E400

mine was doing the same, then just quit all together. I went and got a resistor and everything is working again. Pretty easy to replace as well.