i have a coleman roof top a/c with heat strip i have a white rodgers 1c26-101 t-stat . I have 5 wires i removed rc to rh jumper ,i have removed y jumper and moved it to a terminal A .I have a 12 volt system .My wireing is as follwing pos. ( red ) to rh,green to g ,yellow to y , white to w ( heat ) . If this is correct so far which terminal does ground (blue) go to . thank you in advance