Debating on purchasing hobart champion 10,000 from my employer. machine has 500 hrs. kohler motor. it will make light sparks but no weld. 110v works fine. engine also wont idle down it is stuck around 1/2 throttle. checked bridge rectifier it is okay. visual inspection of board see no burnt spots or obvious issues. keeps blowing CB4 breaker. when you push it in it will idle back down but blows after around 10 seconds. i know these are known for bad boards so im not ruling it out... actually think it probably is the board but unsure of the next step. thanks.