The Weldmart Centurion PC board is the most advanced and easiest board to troubleshoot.  Three different colored LED indicate status of the board. 

The board can be used with a Reed Switch or with the "Hall-Effect Sensor" mounted in the right had corner of the board a simple wire takes the place of the reed switch.

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With power to the board, you test the board by passing a small magnet over the Hall Effect  Sensor, if the board is good, it will switch from low idle to high welding speed. No meters, no test lights, no guessing!

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To check your idler solenoid, with power on, remove the wire on terminal 4 adn touch it to on if the mounting bolts. You get a small spark and hear the solenoid "pull-in".