Answer Hello Del, You will need to use an ohm meter or a continuity tester to check the interlock switch. This is done by touching the meter leads to the terminals on each end of the switch at the same time and checking for 0 ohms of resistance with the ohm meter or continuity with the continuity tester, (continuity meters will beep if connection is good). Read More... Answered by AppliancePartsPros.com | Friday, May 24, 2019