[Richard]

I am not sure about this fan control relay operation.  I know that Terminal #4 has to be grounded to make this relay work. I did my best to trace out this yellow wire that needs to be grounded.  I was able to follow it under the couch until it went up through the floor.  I could not find it any where under the dash or the front terminal panels.  Now I am wondering if this system actually breaks the ground to change the energized state of the relay.  I assumed that since the power came from the DDEC that it would know when to shut off the voltage when it needed the fan to run in high speed.  The 12 volts may actually stay hot all the time and the ground is the control.  Well I wanted to know if everything would work since I removed the front switch, unhooked the spares, and wired the relay as I think it was from the factory.  So I put a jumper on the yellow wire (terminal #3 on the relay), and started the coach.  The fan was running put I was not sure if it was running in high or low speed.  So I pulled the solenoid connector apart and the fan instantly went into high.  I put the connector back together and the fan went to low speed.  I had a smile on my face and was happy, this only lasted about 30 seconds.  The fan started changing from low to high and was fluctuating.  I moved the connector around and the speed would change, then it went into high and stayed in that state.  Then I found out why. One of the wires going into the coil had broken off right where it goes into the coil. Sometimes I just want to cry.  I am now going to remove the solenoid coil and see if I can repair it, or have to order one.  I believe I will call Newell tomorrow and try to talk with someone that can explain the correct operation of this circuit.  I included a couple pictures of the coil.

So, I am confuseded. You said earlier you don’t have a ground on Terminal 3, the yellow wire. In this thread, you stated the fan works great except for the broken electrical connection on the solenoid coil. Did you ground terminal 3? If you didn’t, how is the circuit triggering the fan control relay? I am just trying to figure out if you have a problem other than the intermittent connection on the coil.