K Kaniff Member Oct 26, 2013 #1 Hello, Just got this used ballast and it has 2 ports to plug in either a 120v or 240v but neither one has a label. How can I tell which is which? Thanks,
Hello, Just got this used ballast and it has 2 ports to plug in either a 120v or 240v but neither one has a label. How can I tell which is which? Thanks,
