1

I'm trying to connect the C wire in my Goodman furnace in order to install a new thermostat. I've read all the posts on this forum about this specific issue so my question is whether i'm in the right path or not. Here are a couple pictures of my transformer and the R G W Y and C terminals. Transformer As you can see, on the lower left side of the transformer I have two blue wires and one wire connected to the chasis. From what I understood from other posts, one alternative is to use a piggyback connector to link it to the C terminal.

Terminals I don't know if you can appreciate it on the picture but the C terminal is on the bottom and there's a blue wire connected to it that's also connected to the chasis.

So, to sum up my question is: do I have to use the piggyback connector or being both points connected to the chasis the only thing I have to do is connect the thermostat to that C terminal?

Thanks in advance

1

You should be able to use that screw terminal for the C wire in the bottom picture. I assume that the blue wire on the spade terminal goes to the 24v transformer? It looks like the transformer has a red wire and a blue wire coming off it. The red wire from the transformer is the "R" and the blue wire would then be the "C" wire.

Looks like an easy hookup - on some older units to have to hunt around more to find a good connection point.

  • Actually that blue wire is connected to the chasis as is also the dark cable that comes out of the 24v transformer, that's where I got kinda lost. – Patuno Jun 26 at 12:38
  • The “common” side of the transformer being attached to the chassis is pretty common. – JPhi1618 Jun 26 at 14:38
  • But the fact that the blue wire from the C terminal is also connected to the chasis means I have 24v on the C terminal? Thanks – Patuno Jun 26 at 20:16
  • Yes, if you measure between red and blue, or red and the chassis, you should have around 24v. – JPhi1618 Jun 26 at 20:18
  • Hi, I just wanted to let you know that it worked! Thanks for your help. – Patuno Jun 27 at 20:24

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.