1969 miller big 40 - Miller Welding Discussion Forums
1969 miller big 40. 11-11-2015, 10:24 PM. I bought an older big 40 to restore and have been looking for wiring schematics. I looked on the miller website but I guess it's to old to look up. Im specifically trying to see how the bridge rectifiers are wired up. I have all four brushes connected but the other terminals is where I get lost.