Wiring for my furnace - common wire possible problem

I'm attempting to install a new thermostat ecobee3. I had to use the PEK kit. I had wires W, R, G, and Y going to my original thermostat with a jumper on the Rs.

I connected the W, G, and R to the board and the Y on a nut with a grounded wire (just like my old thermostat had it). I'm not sure where the common should go, I currently have it on a blue wire coming from the 24v box and it's connected to a nut on the chassis. It keeps blowing a fuse.

I'm not sure of the problem but I think it's because the common is not wired correctly. It turns on, but when I go to run the air the fuse blows.

(I have pictures but not sure how to post).

 

The PEK Y connects to one of the 2 wires that run to the outdoor unit.

The remaining wire from the outdoor unit will connect to C ( or in your case the furnace body)

Connect your extender kit C wire to the furnace body along with that second condenser wire from the outdoor unit.

 

Thank you for the info. So, from what you can see here, where would by blue common from the PEK attach? I have the Y above on the nut with the grounded cord that goes outside. (That's where the original thermostat was)

 

That white wire with the yellow tape is the white wire that goes to the outside compressor unit.... correct ? That would mean the red wire in that two wire cable goes to the actual Y connection.

It doesn't matter where you connect to ground. You can put two wires under one screw.... it's not critical...... your choice.

I usually crimp on ring terminals and put all grounds on one screw. Just one way of doing it.

 

The Y wire cannot connect directly to ground. This would be a dead short to ground and would pop a fuse.

I hope it is wired as PJ posted and you are showing me two C connections and the Y is not in the picture.