I started the teardown the furnace. I figured I could get it running and use it to keep the camper warm while I worked. Well it was in rough shape. I’m going to need some parts. The bad news is after doing a bunch of research they don’t make parts for these anymore. Suburban considers these too old to service. I sort of get it, it is 51 years old, lol! After joining a Facebook group for Holiday Rambler owners I found several very helpful people who gave me some insight into this furnace. I also called Suburban and they sent me over a repair and service manual for the Model NT-17C with part numbers(See Below), although none of the part numbers are available.
Part Numbers
Model NT-17C
Pilot Ignition RV Furnace
Vent Cap Assembly 260164
Thermostat 160902 (161154 Replaces Part Numbers: 160737 and 160902)
Fan Switch 203292
Combustion Air Blower Wheel Kit 520400
Motor Kit 520388
Thermostat Relay 230423 (Replaces Part Number: 230530 & 230503)
Thermocouple 160876
Main Burner Orfice 180113
Pilot Burner Orfice 160659
Pilot Burner 160535
Valve Kit 520402
Microswitch 230444
Complete Gasket Kit 520226