Electrical Questions? Ask an Electrician Online.
Welcome. My name is ***** ***** would be glad to assist.
What type of tester do you have available?
Can you access the switch wires?
Access the wiring at the transformer also?
Let me know and we can continue,
Ok, post when information is available.
I shall do my best to be here at that time, please understand we are independent electricians who run our own businesses or work for others and spend time here to assist.
If there is no time to wait on your end because of problems in my time, please feel free to relist the question and hopefully another expert will be online at the time to assist.
Hopefully nothing bars my time to be available here.
Well, first measure power at the switch, both on and off to verify 120 volts is getting out to the transformer.
Then measure at the transformer input for 120 volts, then the transformer output wires for 24 volts, which is most likely the system, but can be 12 volts. Check the transformer label and lamps for the exact voltage used
I believe the transformer most likely fried at the time but can be wrong and only a loose connection on the transformer and hence the pop noise when it disconnected.
Very good, thanks