Wiring a step down transformer

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mentholboy

Joined Jan 26, 2018
6
Hi guys, I have a step down transformer that was connected to a 110V/220V voltage selector switch. I need to connect it to 220V but am unsure how to correctly identify what wire needs to connect to what and there are no markings on the transformer at all. I have 155ohms resistance across the red pair and 155ohms across the blue pair. Cheers!
 

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MaxHeadRoom

Joined Jul 18, 2013
19,198
The two windings in series, it appears the two centre tapped would be coupled together and the outer red and blue used for 220v.
Max.
 
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