Reply to "Repairing old transformers"

Step !:  Do you have line voltage at the cord terminals/primary terminals?

Step 2: With the cord unplugged, do you have continuity across the plug blades?

Step 3: Do you have any voltage at all across the output terminals?

Step 4: Do you have continuity across the output terminals?

Step 5: As the man said, measure across the circuit breaker terminals for continuity, or jumper it out temporarily.