It starts fine, idles good. It is generating 115Ac power at the plugs, and the run idle works correctly when you apply power at the plug. The welding output will produce a light arc (enough to burn the tip or stick the electrode) and the machine will idle up to full power but will not weld.
I have replaced the F1 and F2 fuses.
I have OCV on the weld outputs of:
CC + and - of 26.8V
CV + and - of 26.8V
AC @ 30V
The brushes are showing 16V.
Is there are good starting point to troubleshoot this machine?