Complete novice here trying to install a Nest thermostat in our new home. I hooked everything up according to the Nest guide, but the thermostat gave a power/battery error message. I've gathered that it needs a C wire, but it doesn't look like one is available from the older outside unit - Goodman PGB024075-1.
Photos of the outside unit wiring and diagrams here: https://photos.app.goo.gl/CqgssCF3EULeR7YY8
Edit: I think I finally found an applicable manual - https://drive.google.com/file/d/1RLIEJSde4Kr5889qODMiiCYcrvHgTp0G/view?usp=drivesdk
I've read through a good number of similar posts, and I understand that if no C connecter is available on the board (at least I couldn't find one), I should be able to splice(?) into one of the wires coming out of the 24v side of the transformer (Pic 2). Not the red wire though. If correct, where exactly would I do this?
There are already spare small wires running into the house to the thermostat (Pic 5), so I should just need a short length of extra wire (Google says 18/5?) and to know where to connect it.
Oddly, the two capped white wires at the bottom are seemingly not connected to anything (Pic 5). They appear to run back into the unit somewhere (Pic 6). Unsure if one of those could be used?
Haven't been able to find a manual online, so hopefully the photos of the wiring diagrams inside the panels are helpful.
I'd really appreciate any additional guidance on this!