1976 miller big 40 no weld or aux power

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So I have a 1976 Miller big 40 when I got it the machine it would Weld and have auxiliary power I pressure washed it to clean the grease off of it and it wouldn't Weld or have any auxiliary power so I flashed the fields and I got power back to everything but once I shut it off and fire it back up it loses its magnetic field it will also lose it when I turn it to low idle I have to keep flashing it with a 12 Volt battery so I can use it can anybody help
Reply:

Originally Posted by tark87

So I have a 1976 Miller big 40 when I got it the machine it would Weld and have auxiliary power I pressure washed it to clean the grease off of it and it wouldn't Weld or have any auxiliary power so I flashed the fields and I got power back to everything but once I shut it off and fire it back up it loses its magnetic field it will also lose it when I turn it to low idle I have to keep flashing it with a 12 Volt battery so I can use it can anybody help
Reply:I do not have one but hopefully it’s something simple
Reply:

Originally Posted by tark87

I do not have one but hopefully it’s something simple
Reply:Iv talked with a shop here and they seem to know why it’s doing that but I’d rather fix it myself… Iv got plenty of running machines I can use until it’s fixed lol