Isolation transformers help

Buakaw

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Hi, anyone know how to identify the correct leads on an isolation transformer? This is inside a mk4 cab and it had no chassis which I'm trying to install now, but I'm not sure which leads to connect.

Update

I tested all the lines. The closest combination to 120 was 108v and 130v? I'm guessing it's bad and that's why the chassis was not in the cab when I got it?
 

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I have a replacement ISO in a cab that does 130v even under load. I thought that was a flaw in the replacement ISO but 130v is still within the acceptable range for the monitor so I left it alone.

OP, I'd be curious if your does drop down a bit under load.
 
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