No C wire connection on old Goodman furnace

furnacethermostat-c-wire

I have read for hours, and tried figure this out myself, but I need help. I'm trying to connect the Blue C wire from the tstat, without a C terminal at the furnace.

enter image description hereFrom what I have read, it seems to me that I would connect the C wire from the thermostat, to one of the 3 BL wires coming from the 24v transformer. If that is correct, I am still not sure which of the 3 BL wires to use.

Thanks in advance for any assistance!

Best Answer

Yes, you'll connect to any of the blue wires coming from the transformer.

If there's an empty terminal on the transformer, connect there. If not, you might be able to use a piggyback spade connector.

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Otherwise, connecting at the point of grounding would be the next easiest location.

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