Miller 280nt trailblazer has AC power but no weld output? already checked the f1 and f2 fuse

SOURCE: no output from my lincoln ac welder/generator

Check excitor coils, they produce power from the generator head..

SOURCE: In my welding m/c Earth cable sime times brunout

was that "the earth cable burns out"- earth cables will burn out due to
1] the connections are loose and
2] the size of cable being used is too small,
increase the size of the earth cable, many manufactures fit a very thin cable to the set which are cheep and nasty, depending on the amperage used multiply by 11/2 times, tell your supplier what the sets maximum amperage on the set and he will give you the correct size. don't get it to long, and always get copper cable not aluminum.this also applies to the welding cable.

SOURCE: no weld output or 115v output

Hi
My name is rob, lets see if we can solve your problem

If the welders been working ok first question is what has changed, has it been moved or modified in any way?

Next, are ther any fuses or breakers fitted? are these ok?

Next, most engine driven welders have one major problem.
Vibration.

It shakes stuff loose, undos connections and damages static components,
Take some covers of to expose the internals and with THE ENGINE STOPPED check along the length of the cable harness especially at the ends of cables, give each terminal a tug with the cable to make sure there are no problems there. Also check the condition of the insulation of the harness along its lenght. at this point you may find a "hidden" in-line fuse somewhere in the harness if your lucky!

If none of this helps it gets a little more tricky, could you give me make and model? that would help a lot.

Regards
Rob

mamicheddy

• 79 Answers
• Posted on May 08, 2009

SOURCE: miller bobcat 225g plus welding problem

If the idle is not working, then it is either you idle solenoid attached to the carberator or your idle board is bad. If you apply 12Vdc to the idle solenoid is should move, if not then the solenoid is shot, no good. If it works then you idle board is bad. Also, check to see if you are 60Hertz by measuring at the outlet with a frequency meter. I recommend a Fluke meter. You should have 120Vac and 60HZ at the outlet. If the frequency is low then your engine speed needs to be increased. The idle solenoid could be causing all these problems.

SOURCE: I HAVE AN OLDER MILLER BIG 40 RUNS BUT NO WELD OR

check the ground ,make sure is tight.look around the machine and see if theirs a switch or a nob to turn from mig to arcweld...