hi there honeywell rth 5100b
I am getting heat with fan but the ac compressor not coming on for cooling,fan does though

I have 5 wires coming out of wall to thermostat

white
red
yellow
green
black

connected all wires from wall except black to thermostat
w- I connected the white from wall
r -with jumper rc I connected one wire the red from wall
yellow to y on thermostat
g to green from wall
and where does the black wire go?

Go to your air handler and see where the wires are connected there and post back.

air handler??

IS THAT THE OUTDOOR COMPRESSER FOR AC?

I tried the old thermostat and it still works

basically with 4 wires no yellow

Where is the blk wire connected at at the air handler (inside unit or furnace?)

not sure have furnace top door off but I see a black wire connected to a round device,,
other then that not sure