About the only way to positively identify the problem, other than a visual inspection reveals a short to ground, is to get a box of 2 1/2 amp fuses and rig up a fused test lead.
You can do one at a time, or make up one for each component, but what you do is connect the fuse inline to each output from the board.
If there is a relay or the gas valve drawing too much current, it will blow that fuse. If those remain, and the board fuse still blows, then you can assume the board it bad.
It's a lot of trouble, but beats expensive guess work and possibly multiplying problems!
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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