ATA 56

Windshield Resistance:
The following resistance should be applicable to a new or used windshield.
Between terminals 1 and 2: -0.720 to 0.974 ohms @ 75 Degrees F +/- 5 degrees.
Between terminals 4 and 5: -0.720 to 0.974 ohms @ 75 Degrees F +/- 5 degrees.
Between terminals 3 and 6: this reading will vary with teprature changes.
the following are three examples, you will have to calculate anything in between.
Between 110 degrees F = 342 ohms
85 degrees F = 328 ohms
50 degrees F = 310 ohms