MAD ammeter bypass question

Nice demo. I think you proved that most of the amps are going through the shunt wire. If the shunt wire had been suitably fused. Did you have a fusible link in it? If so it proves they don't work well other than to maybe prevent total melt down although you didn't go that far. With a suitable fuse in the shunt wire it would have tripped and then the stock fusible link burnt up shortly thereafter. It would be interesting to see this tested with a 30 amp MAXI slow blow fuse. Littelfuse publishes curves to show how fast the fuse blows over time with varying loads.