Freezer is fine, refrigerator is too warm

Totally thawed out and dry freezer. Restarted power for 8 hours. Lite frost on evaporator tubes. Turned timer until freezer fan shut down. No evaporator heater startup to where frost was melting, left for 20 minutes or so and freezer fan restarted, frost remains on evaporator coils.

If I cut the thermostat wires and connect directly and the evaporator heater warms up then the thermostat is the problem…correct?

If I had a VOM meter this would also so no connection at the thermostat…correct?

If thermostat connectivity is good then the evaporator heater is the problem…correct?

As long as the defrost timer is cycling to start and stop the freezer fan, does this mean the timer is cycling correctly and the problem is either the thermostat or the evaporator heater exclusively?

Allen