checking if output transistor is grounded to case. using the diode setting i get a rise in ohms from chassis to back of transistor, i disconnect the red wire and the transistor plug and get open circuit. when i put the meter on continuity test with the transistor connected i get a beep when i place the red test lead to the chassis and the black test lead to the back of the transistor. If i switch the test leads i get no beep. I get no beep when the red wire on transistor and transistor plug are disconnected.