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There is probably no C terminal because on a heat only application it normally does not have to go anywhere outside the furnace, so it is hard wired to all the various components. Find the wire from the transformer that goes to the R terminal (maybe on the rear of the terminal board). The other LOW VOLTAGE (secondary) wire leaving the transformer is C and you can cut into it to do whatever it is you are doing. Be sure you are not fooling with either of the high voltage transformer (primary) inputs. If you can read a schematic look on there and it will tell you the wire colors you are looking for and where the terminations can be found.

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Q: Where is the C terminal on a Goodman Furnace GMT090 that only shows R Y G?
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