Thread: How to test rear windshield defrost/defog?
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Old 02-20-2020, 06:24 PM
SD Blue SD Blue is offline
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
Hmm... the pocket compass idea has some merit. I'm betting even a small battery, connected to the terminals, might be sufficient to cause a fluctuation of the needle when you scan it from top to bottom. It's worth a shot!
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84 300SD 350K+ miles ( Blue Belle )
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