Air condtioner wont come on

Have a 5er with 50 amp service. AC is a 15000 Dometic 11 years old that has only been used sparingly, not full time. The last time I used it I thought it was slow to come on but it did and worked well. Past week-end tried it and nothing, no compressor, no fan no sound at all. Breaker is ok and fuses are good. Replaced the "starter" about 4 years ago. Put on a hunter thermostat about 7 years ago. The furnace would not come on as well. Still have the old thermostat so I put it back on...no air cond. But the furnace did come on, turned it off double checked wires to thermostat and furnace came bacon even though the switch was OFF. Eventually turned it off some how. I feel I have wired the old thermostat incorrectly, it is wire as Black to ground, Orange to fan, Blue to Hi fan, Yellow to cool, Red to 7.5, White to furnace, Green is not connected.
I also have 13000 ac in the front which works fine, it is not on the same thermostat.

I would appreciate your thoughts as to the problem and if someone can give me the correct wiring for the Dometic thermostat that came with the unit 11 years ago.
Thanks for your help.