Blowing termal follow up
I had only tested the heater with power disconnected, either uninstalled or pulling the dwasher out, disconnecting the wires and putting the leads there. One digital meter reading varied greatly so I switched digital meters and now have a more consistent reading.
On one occassion I happend to see the heating light go on for split second then the power failed. This last time the timer was at about 48 minutes left on normal cycle when the power failed. I opened the controls and the yellow wires were very hot, hotter than anything else in the area.
I replaced the heater twice so it probably is not the heater. Are there instructs to test if the motor is drawing too much current?