What is the voltage and amps on the transformer rectifier?
What is displayed would be the OUTPUT of the TR.  Those values tell you that (if) the TR is working, and how hard it is working.  If it's supposed to be putting out 12 volts but the actual output is something significantly different, then the TR isn't working correctly.  The amps value tells you how much DC current is being demanded of the TR -- maybe something on the associated bus is consuming too much current (and is thus perhaps the source of smoke that you're trying to eliminate), or another TR in parallel has failed.  The failed TR would show 0 volts &amp; 0 amps, while the operative TR would show normal volts &amp; higher than normal amps.

If you want to know the voltage of the input to the TR, you'd select the generator or bus that is powering the TR to see that.  Voltage is typically a value of a bus, while amps is generally the value of a source, such as a generator, battery, or TR.  The source is putting out however many amps. While you can measure the voltage of a bus coming directly off of an electrical source (so we talk about a generator's or battery's or TR's voltage), you can also measure (and will frequently care more about) the voltage of a bus, independent of what source is powering it right now.  If my Essential DC bus has normal voltage, then the important things on it can be expected to continue operating, regardless of whether the current source for that bus is the #1 TR or the #2 + #3 TR's in parallel or the battery charger or the main battery or the standby battery or whatever else that particular aircraft may have.