I have Coleman central air unit and electric furnace, it came with a Coleman 7900-7541/a TYPE 1C26-118 thermostat hooked up to it, it has a white,green,yellow,and red wired hooked up to it, there is a blue wire there but it is not hooked up. I am trying to hook up a digital programmable Honeywell thermostat model CT8602C, the wires are not labeled anywhere on the old unit, the Honeywell has quite a few terminals for wire hook ups on it. Does anyone know which color wire goes to which letter terminal?
Thanks for any help in advance, much appreciated

Most thermostats and furnaces have the contacts labeled R, B or C, W, Y, and G for the corresponding wire colors. It may be wired to have the A/C control wires return to the furnace and its controls and then a second wire goes to the A/C unit. Internal wiring may replace the green wire if the thermostat does not give you the option of fan only or continuous fan. Digital or programmable thermostats may need the blue wire connected to them.

You may need to jumper the red wire to both R and RC.