St3ve
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I have one of those. On mine there are two wires marked on the instead, one for 120v the other for 240v. Just switch only that wire. I don't know how else to tell you, thats all I do. Mine does use the same plug.. however on a different ballast I recently had to switch out the older style plug for a new one. Found a replacement online for cheap..Any of you know how to rewire an old sun light supply ballast from 120v to 240v and can I use the same plug in wire as before