The slide switch works . The resistor works . I found a relay up by the blower housing Denso # 068700-3300 it has a condom over it . If I manually close the contacts on this relay the Heater Blower runs as is intended. All speeds work fine when contacts closed .
So I assume this is the blower fan relay. I have no wiring diagrams so does anyone know where this relay gets it power from.

 

Sounds like you have a bad relay if you close the contacts and everything works fine. What year is your truck that might be a little more helpfull narrowing down your diagram. There are wiring diagrams in the Rave manual that might help you. Its a free download I just forget the website off the top of my head, if you do a search its out there.

 

It's a 96 Disco I don't think it is the relay because it has no trigger signal coming in to it to energize the coil. I have RAVE but does not help.

 

RAVE has the electrical if you look in the correct section.