A continuity tester is similar to a penlight flashlight, in that it has a battery(s), a lead wire with clip and a metal point. When the clip from the lead wire is touched to the metal point the light will light, indicating continuity. To use with your harness, you will clip the lead wire to a wire at one end of the harness and then probe the wires at the other end. When the light, lights you have identified the other end of the wire - it has continuity. For example: if you want a brown/green wire to go from the switch to the thermostart, clip on to the switch end of the wire and probe all the wires at the other end of the harness. You are looking for the light to light for the thermostart connection(s) and no other wires should show continuity. In this manner you simply work from the 240 wiring diagram making one connection at a time.
There is a similar tester called a "test light". It has a lead wire/clip, metal point and contains a bulb - it has no battery. To use, the lead wire is typically connected to a ground source and the light will light when the point is touched to a source of 12 volts.
Both testers are available at NAPA or other parts stores and can be had for $10 +/- each.
It would be helpful if you post the 240 wiring diagram you are working with.
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