7.6.9. Check of thread of heating of back glass
Install the ignition switch in position of ON.
Include a heater of back glass.
Fig. 7.90. Check of thread of heating of back glass
Fig. 7.91. Connection of the probe of a tester to the ends of thread
Connect the positive probe of a tester to the positive end of each thread, and the negative probe to the mass of a body (fig. 7.91);
Moving the positive probe from the positive end of thread to negative be convinced that tension decreases respectively.
If tension changes quickly, thread is faulty. Repair thread.