4 wires at thermostat: R G B W (red green blue white) 5 screws at furnace: G C W Y R Single-stage gas furnace with A/C unit
The home's previous owners kind of did everything in a very make-shift way.
I'm trying to replace an old, analog thermostat (4 conductor) with a new wi-fi thermostat (needs 5 conductors). I added a new single wire between the thermostat and furnace. I moved the existing 4 conductors from the old thermostat into the new one. (No problem.)
Here's a picture of the board at the furnace. Where should I attach my newly added single wire?
I have a voltmeter. Can I test for 24 volts? How and where?
I've already watched countless videos on using various methods to solve the common "c-wire missing" problem. But I do NOT want to do any of these, since I (now) have the 5 wires I need:
- Use the fan wire for the C-wire and just forget about ever using the fan-only switch again.
- Use more complexity with that add-a-wire circuit kludge.
- Buy a different thermostat that eats batteries constantly.
- Install a new 24-volt transformer.
Where's the simple "I've already added a new wire" video????
Also, how can I measure the total load on the 24 VAC transformer using my multimeter?