You can keep the existing balance connector, just move the wires over as needed so they are still in consecutive order. This just means you will be left with an extra slot on the end of the connector.
Since you now have a 2s pack, you will have 3 balance wires. One will be the same point as the main + wire, one will be the same point as the main - wire, and one will be the junction point between the two cells. Remove the extra wire.
If you need more info, we are going to need a large clear picture.
remove the extra black wire since that cell is gone, then solder the positive wire to the positive sode of the pack, then slid all the wires over from the positive over
when you say slide it all over you mean i should switch the red and black wire? move the red over to the left and then i actually dont have to put the black wire back on?
if that is what you mean cant i just take the red wire off and solder the black wire to the pos?
hm that is strange because when i tried doing that it did not work.. my balancer wouldnt pick it up. its pushing 8 volts so i dont think the cell voltage is a problem
Try to keep the red wire since it will tell you which end of the balance tap is +. Having all black wires could lead to a catastrophe if due diligence is not followed 100% of the time.