Need the diagram for an old welder, ac/dc 125/225 need to find out how to hook the fan up

Check the dial indicator. Sometimes if someone changes the amps while welding, there will be a break in the coil. It will work at a different setting as long as you are away from the break.

Buy a new circuit board as it will be cheaper in the long run as the solder has damaged vital parts on the board. It will take a lot of frustration in fixing all parts .

Fan Motor MOTOR
2910.0
230.0 AC
Here is a Picture of the wiring Diagram that should be on the inside of the rear cover If this is hard to read Here is a link to the original

DC connection not working

The fan motor has probably burnt out, i see this alot...make sure the connections are good....you can try putting 120v to it directly, if it doesnt run you need a new one...if it does then you need to check all your connections

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

I took my old one to Grainger and they ordered a new one that is 230V. Total cost of motor and fan $27.00

i have a old miller thunderbolt CC*AC/DC welder its wire single phase 480 can it be switched to 220 single phase

try the company web site

if the unit does not say ac/dc it is probably ac only,forey is still in business,factory is in colorado.

Have you connected the feed from your breaker box to ADJACENT lugs on a dual pole breaker? By code you must use a ganged breaker.

You should use a voltmeter to verify the plug is getting power on teh desired pins.