|1.||Check for voltage between the positive terminal (A) and body ground with the ignition switch and defogger switch ON.|
There should be battery voltage.
|2.||Check for continuity between the negative terminal (B) and body ground.|
If there is no continuity, check for:
|3.||Touch the voltmeter positive probe to the halfway point of each defogger wire, and the negative probe to the negative terminal.|
There should be about 6 V with the ignition switch and the defogger switch ON.