Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to Resistance Set meter to measure resistance
Disconnect the connector from the spark generator

Measurement:

Test 1:
Measure the resistance across connections 1 and 2 at the spark generator (Live and Neutral terminals).
Expected resistance Open Circuit.
Test 2:
Measure the resistance to earth across connection 1 at the spark generator and a suitable Earth.
Expected resistance greater than 1 Mohm.