Prestolite (now a subsidiary of Broad-Ocean Motor Co.-Chinese) manufactured automotive electrical parts for other manufacturers. Miller and Lincoln used the Prestolite IBT- xzxxx. I prefer these over the new Petronics (these are outstanding units). The Prestolite was built in an era where the industry made maintainable (repairable) assemblies, at one time they offered every part to repair, not any more.
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.
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!
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".
