ranger 8 no output

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Hello, I have a Ranger 8 and there is no power from either the 120v or the welding side. I changed the pc board, tried a different diode, the one that is connected to the capacitor, and there is still no power output. Could the capacitor be bad? The rotor is putting out 4.5 volts, also that is what I am getting from the 120 plugs. It seems the field is not getting excited. Could it be the capacitor is not charging or is the rotor not putting out enough voltage? I checked the exciter field and it is not open. But it is getting a resistance reading to ground. Any help would be much appreciated.Thanks
Reply:Do you have voltage to the brushes?   AC or DC?DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:check the rectifier bridge it should be a small 1" square with maybe 4 wires to it...my hobart had the same thing happen about 5 years ago. it cost me $10 for the rectifier bridge...do you have voltage/amp gauges? if so they should be reading something. if there's no reading try to self excite the machine... it's pretty simple but dangerous too. start the machine, take jumper cables and clamp one lead to the positive battery pole, take the other end and touch one of the rings that the brushes go to and make it spark a few seconds *obviously going near a rotating part is dangerous - be carefull.This is how a Hobart tech told me how to do it.
Reply:I have 4.5 vdc comming from the rotor, and I changed the rectifier.  How much voltage is needed to excite the field? And do I need ac or dc to excite the field?
Reply:Not sure how much voltage is really needed to excite the field. My machine (Hobart Mega Arc 250G with a Ford 4 cylinder engine) uses a regular car battery so therefore 12 vdc worked for me. Once again this is how a Hobart technician told me to self excite the machine. Hope this helps a little more. Did you call Lincoln? Try that... Good luck!
Reply:Thanks I wll try, I am going to call Lincoln tomorrow morn to get a idea of the problem. Thanks for the info and help!
Reply:I flashed the field and still there is no output. Could the stator be bad? I changed the pc board and the rectifier and I am getting 12 volts to the board.
Reply:I wouldn't change anything until you know what is wrong.  You can check the rotor with an ohm meter.  with the brushes OUT, you should get a few ohms resistance between the slip rings.  If its open you will know it.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Ok, I will give that a try.Thanks
Reply:Hello, I pulled the stator out, took a sniff and smelled burnt wires somewhere, which I found some field windings cooked. I also noticed that one of the welding outputs from the stator was rubbing on the metal case so I figured it burnt out the winding.          Does anyone know where to get a stator at a reasonable price either new or used?         Thanks again for your help.         Bob