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MILLER STYLE 14 PIN RECEPTACLE DIAGRAM

1. With the machine turned on (the cooling fan may or may not run with the machine "on"). Normally of the machine has a pilot light that lights when the machine is "ON".

2. With a meter on AC Voltage check between pins A & B. You should see 24 Volts AC (a digital my read higher than 24 volts).

3. With a meter on "AC Voltage" check between pins I & G you should see 115 volts AC (a digital my read higher than 24 volts).

4.Jumpering Pins A & B will "turn on" the contactor-you should see the volt meter should read open circuit voltage (normally 25 volts DC or higher)

5. Turn the machine power off. With and Ohmmeter on the R X 1 scale you should have continuity between Pin K and the welder chassis (try one of the sheet metal bolts).

If these test are all positive, you have a Miller style 14 pin receptacle. You find this receptacle on Miller®, Comparc® (Mexico), and older Thermal-Arc® power supplies.

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