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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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