Where are your trigger wires hooked up ?
hmm, I did not do anything with the trigger wires. is there any directions in the forum on how to do it?
Orange /Purple I believe . Post the model serial number from the bottom of your miller 375 we 'll try to can confirm. Some unit are slightly different .
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The SN: ND033089P.
Spectrum
375 X-TREME And XT 30 Torch
Owners Manual
https://www.millerwelds.com/files/owners-manuals/O253555G_MIL.pdf
Parts Manual
https://www.millerwelds.com/files/owners-manuals/O253555G_MIL.pdf
I’ll thumb through it shortly I have a couple chores to take care of .
Here is where you search for miller manuals by serial number
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Thanks so much for your help. it looks like I need to connect Orange and Vin/purple cables to torch firing cable, am I correct?
they will need to be connected to Langmuir’s torch NO/OFF on the electronics enclosure.
Yes , shorting them together will fire the torch.
Be safe 
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It worked. Thank you again for your help.
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