[RegaNewell]

Thank you Richard for all the information.  I contacted Newell and had a great conversation with a Gentleman named Robert.  He stated that the yellow wire does indeed come from directly from the DDEC.  Newell adds nothing to this circuit, to monitor or change state of the relay.  I will have to get with a Detroit Diesel Shop (The DDEC was changed out at "Big Cabin Diesel" in 2014)  They have actually changed all the filters and fluids on our Coach for the last 12 years.  They also performed the 300,000 mile value clearance and adjustment. While I had Robert on the phone, I asked another question.  I told him how I had a 6th Breaker in the very rear electrical Panel with no label, but it had a Purple Wire connected to it.  I told him that I had a friend that also had this breaker (with purple wire) and it was Labeled "Link 2000".  What in the world Is link 2000, and what is its purpose.  Robert explained it to me, that this purple wire goes to the inverter controller, sometimes in the Kitchen Galley above the stove. This monitors the difference in Voltage between the house batteries and engine batteries, and will generate a code on the controller display if the starter batteries are low, as a Warning or Error Code.  This is information that will allow you to choose to Merge your batteries and allow the starter batteries to be charged also.  I told him how Coach 427 did not have this breaker, but mine did (Coach #432), and that Coach 512 also had this breaker.  He stated that since our Coach was a show coach (Tampa Show) that ours may be the first coach with this option.  He stated they always tried new things with a show coach.
I cannot believe that I started in on Post #11 of this thread and did not read the previous post (1-10). I actually spent over an hour searching this forum that had anything to do with (Fan Control, Fan Relay, Hydraulic Fan etc..).  I was a little overwhelmed with how many pages came up on these searches, 63 pages, 27 pages, 42 pages.  I need to either use better words in my searches or spend more time looking through all the threads..  The information is there, I just did not spend enough time searching, my bad.
Pam is actually setting up an appointment with Big Cabin to have the fluids, filters, and greasing completed.  I will talk with them about this issue and go from there. Of course this all depends on when I get the Coach where it can drive down the road again.

Thanks again for everyone staying with me during these long post's.