Recently picked up a 1997 33ft sandpiper TT. The previous owners wired the AC always on, and has no thermostat. I cant find any diagrams on how its wired. Looked online and came up blank. There are 4 wires, blue, yellow, red, orange. The Y,R and O are wire nutted together and AC blows cold. What is the blue wire? It's not connected to anything.
The unit is a duotherm m#57015.621.