Many of the Whirlpool dishwasher have intelligent wash motors on them now ( Stupid motors) . They should not read 0 ohms . This is a dead short. But rather they should read low ohms ie: 3 up to 8 or 9 ohms. It turns out that many of their motors are failing because they are not drawing and exact amount of current and when this is the case, the main circuit board will not supply enough power to make them run. Most of these smart motors ( stupid) have internal circuit boards and also can stop the motor from running. I experimented on a motor of this type and bypassed all the internal circuits and behold the motor ran with 120 ac applied. I don't suggest doing this!!! Why build complicated motors. Just make one that has just
motor windings and NO internal circuits . A 30 watt microwave bulb is a good substitute for the load of this motor and will let you see if the main control board is good or bad. Be very careful with the 120 volt connector that is used to connect to the motor. It is delicate and will have live 120 volts present when the main control board is sending voltage to the main motor. ( plug is removed from the main motor for this test) This bulb test will prove if main circuit board is supplying proper power and will also check out the wiring to the motor. Hope this helps someone.