![Trying to replace this old 2 wire thermostat for a newer digital one. Problem is older unit does not have leads labeled or which cable is which. Any help on how to Trying to replace this old 2 wire thermostat for a newer digital one. Problem is older unit does not have leads labeled or which cable is which. Any help on how to](https://i.redd.it/j9mnonzn7nu91.jpg)
Trying to replace this old 2 wire thermostat for a newer digital one. Problem is older unit does not have leads labeled or which cable is which. Any help on how to
![Honeywell TH1100DV1000 Pro-Digital 2-Wire Heat Only . Part Number: TH1100DV1000test | Shop Thermostats Honeywell TH1100DV1000 Pro-Digital 2-Wire Heat Only . Part Number: TH1100DV1000test | Shop Thermostats](https://www.shopthermostats.com/wp-content/uploads/2015/12/TH1100DV-c1.jpg)
Honeywell TH1100DV1000 Pro-Digital 2-Wire Heat Only . Part Number: TH1100DV1000test | Shop Thermostats
![Two 2 wire Honeywell digital thermostat to replace mercury switch. Convert from mercury switch - YouTube Two 2 wire Honeywell digital thermostat to replace mercury switch. Convert from mercury switch - YouTube](https://i.ytimg.com/vi/YqTUSs56E7A/maxresdefault.jpg)
Two 2 wire Honeywell digital thermostat to replace mercury switch. Convert from mercury switch - YouTube
![Honeywell Home 5-2 Day Programmable Thermostat with Digital Backlit Display (6-Pack) RTH2300B38/6PK - The Home Depot Honeywell Home 5-2 Day Programmable Thermostat with Digital Backlit Display (6-Pack) RTH2300B38/6PK - The Home Depot](https://images.thdstatic.com/productImages/3337aefa-03a8-4077-91b7-ff18522c6273/svn/honeywell-home-programmable-thermostats-rth2300b38-6pk-31_600.jpg)
Honeywell Home 5-2 Day Programmable Thermostat with Digital Backlit Display (6-Pack) RTH2300B38/6PK - The Home Depot
![Old Honeywell 2 wire AC thermostat (with 1 extra wire behind) - can I modernize this with Ecobee? : r/ecobee Old Honeywell 2 wire AC thermostat (with 1 extra wire behind) - can I modernize this with Ecobee? : r/ecobee](https://preview.redd.it/old-honeywell-2-wire-ac-thermostat-with-1-extra-wire-behind-v0-zgb7bnf4hv2b1.jpg?width=640&crop=smart&auto=webp&s=5777ab68b14bb9f1cbf026f907503bf83066d26f)
Old Honeywell 2 wire AC thermostat (with 1 extra wire behind) - can I modernize this with Ecobee? : r/ecobee
![wiring - 2 wire thermostat wire want to be able to select fan only - Home Improvement Stack Exchange wiring - 2 wire thermostat wire want to be able to select fan only - Home Improvement Stack Exchange](https://i.stack.imgur.com/eH39I.jpg)
wiring - 2 wire thermostat wire want to be able to select fan only - Home Improvement Stack Exchange
I am replacing an old Honeywell thermostat heat only. The wires are not labeled and no label on the terminal. What would the brass terminal wire color be and what color would
![2 to 8 Wire All Thermostats Wiring Diagrams (Honeywell, Nest) | Thermostat wiring, Thermostat, Electrical diagram 2 to 8 Wire All Thermostats Wiring Diagrams (Honeywell, Nest) | Thermostat wiring, Thermostat, Electrical diagram](https://i.pinimg.com/originals/45/2d/cd/452dcd199d840f3929b6b52f03c0481b.png)