Three of my transformers seem to be dead. Changing bulb doesn't work. Are there any options other than buying new transformers to see if it makes a difference?

Three of my transformers seem to be dead. Changing bulb doesn't work. Are there any options other than buying new transformers to see if it makes a difference?

You could use a digital voltmeter to see if you are getting power...

Before you buy transformers, consider a new fixture. Compare the prices. Usually the component price is 2-3X the replacement price.