Looking to connect a newer WiFi thermostat which requires the connection of a c wire. My old thermostat didn’t use a c wire however there is a c wire present in the bundle of wires ( unconnected at thermostat and inside air exchanger/furnace. However I am a little lost on where to connect this loose C wire inside the air exchanger compartment. My furnace doesn’t use the typical screw terminals I’ve seen while looking for the solution to this. It uses a clamping type of connector ( see pics) there is a C terminal however this is already used. The wire from the c terminal goes to some black block ( I believe is a heat sequencer through some googling) then another connection off of that “heat sequencer” connects to the red wire from the 2 wire cable that I believe goes to the air conditioner? Any assistance on where I need to connect this c wire would be greatly greatly appreciated!!!! If any additional pics are needed I can do that ASAP 
Help connecting unused C wire for Smart Thermostat
thermostatthermostat-c-wirewire
Related Solutions
TR is Common on your unit, Every 24 volt device will have a Common leg as well as the 24 volt hot leg, just as a car battery has pos and neg, common is akin to neg in this case. Common is called this cause every 24 volt circuit terminates upon Common to complete the circuit. The last pic shown is the "time on" "temperature off" fan delay, the 2 lighter colored wires are low voltage, 1 id the heat circuits 24 volt hot leg being W or white, the other being Common or C. The gas valve has the same 2 24 volt leads as well, without completing the circuit nothing will work, every electric circuit requires 2 legs of power be it 1 hot leg and neutral/Common or 2 hot legs as in a 230 volt circuit. Google 40 VA HVAC transformer to see what they look like so you will be able to locate it. Your 2 wire thermostat will have only red and white shown on my diagram
Note: the solution here is the querent's -- I'm simply writing it up in a CW answer to get this off our plate as the querent has not returned to migrate it from his question-edits to an answer himself.
SOLVED (01/04/15): I decided that the T terminal was exactly what I needed so gave it a try and everything is working perfectly. I also pulled in some 18-5 thermostat wire. Here is my setup, in case it might help someone else:
Furnace: Lennox G14Q3-60-13
Thermostat: Honeywell RTH6500WF
I've attached pictures of my connections.
Best Answer
This is easier than it sounds
Since we know that your air conditioning is turned on by the thermostat putting 24VAC on the yellow (Y) wire that's connected to a wire in the 2-wire low-voltage cable to the compressor contactor (the white wire in that cable, in your case), we know that the other wire in that low-voltage cable (the red wire, in your case) must be connected to C. If it wasn't connected to C, your air conditioning could never work, as current needs to flow in a closed loop from the 24VAC transformer, through the thermostat contacts, through the compressor contactor's coil, and back to the transformer in the furnace in order for the contactor to be energized by a closed circuit.
So, since we know the junction of the thick blue wire and the thin red wire is where the C wire from the compressor connects, you can safely add your new C wire to that wirenut junction, install your new thermostat, and enjoy!