Could be the motor. As long as you used a voltmeter to monitor the voltage when you switched the machine on. If the voltage drops off of 120 volts at the wall, you have electrical problems on that circuit. If the wall plug for the washer has 2 outlets, you can use the empty one to monitor current drop during the test.
The Amana manual is HERE
, so you can read up and check the motor according to the info herein.