My miller Legend aead 200LE stopped coming up to rpm when I struck an ark. And it will not come up when I switch the start switch to run. or rabbit. I ran a jump wire to the govener and it works . I checked the wire feeding the gov. and have no power. The fuses I have in line are good.The idle toggle switch is in weld position. what commonly goes out in them and do you hav a scematic? Mike

What part or area is overheating?

Here is the manual for a miller machine. It may be close but it really depends on the serial number. Troubleshooting starts on page 22. There is a schematic on page 26. Check at the lower left for starter circuitry. https://www.millerwelds.com/files/owners-manuals/O411P_MIL.pdf

I had a 78 rabbit did the same thing. It was the fuel pump relay. The connector was under size and burnt up. When you star the car on the old Rabbit the pump runs off the ignition switch. Once it starts the relay needs a pulse from the distributor to let it know that the car is running and keep the pump running after it starts. If not the relay times out and pump stops pumping gas. Its for safety so if in a accident and the engine stops the pump wont pour out gas

The wiring diagram for the charging system on a Miller Aead-200le Constant Current AC/DC Arc Welding Generator Gas Powered will be provided in the operator's manual for the machine. The manual will have detailed information on the wiring diagram of the charging system, including the connection and function of the starter under the flywheel.
It's important to refer to this manual for specific instructions and guidelines for the wiring diagram of the charging system. You can find the manual on the Miller website or you can contact Miller Electric and request a copy of the manual.
If you cannot find the manual or if you are not familiar with reading wiring diagrams, it's best to take your welder to a qualified Miller Electric welder repair service center, they will be able to provide you with the necessary information and help you troubleshoot the issue.

All welders have what is caller a duty cycle switch that becomes hot expands and disengages the welder unit. Much like a thermostat works. It may well be that yours is defective. If you are handy you could do an R&R yourself. First you need to observe that this is your problem. If you are able to reset the unit after some cooling or the unit resets itself this R&R should correct your problem.

low idle board?

Check this out:

http://www.ebay.com/itm/MILLER-AEAD-200LE-CONSTANT-CURRENT-AC-DC-ARC-WELDING-GENERATOR-GAS-POWERED-/310368057796?pt=BI_Welders&hash=item484360b9c4

It's likely that your pedal is the problem. Pull the cover and check it electrically - these have been problematic in the past. You can further troubleshoot by selecting constant output and test the output.

A welder does not speed up when an arc is struck. It is normal for a gas welder to stay at a high rpm. If it did not, it would be very hard on the machine as a high amperage is needed to start an arc for welding, and to be consistant. Unlike a generator which will "idle down" when not in use.

Go to "millerwelds.com" and enter you model number in the search on the home page at the bottom, right hand side. This takes you to another page and you can fine tune what you are looking for.

Good luck and hope this helps.