If there is a resistor pack, and I think there should be, it should be behind the generator door, passenger side, on the top of the heater blower box on the firewall, up above the generator door opening. I don't think you'll be able to access it without removing the generator door. You may not even be able to see the resistor without using a small mirror on an extension rod.
Jim & Kate
2016 Creekside 23RKS, 2014 Ram 1500 Eco Diesel
1995 Monaco Dynasty 36', 2005 Honda Pilot