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911 1972 Rear Defroster

Electrical

Vehicle Information: Model: 911T; Year: 1972; Body Type: Coupe; Engine (type, size, modifications): 2.4L w/2.2E P&C/cams/MFI; Total Mileage: 62000;

I'm trying to replace the rear glass on my '72 911T due to degradation of the defrost elements. There seem to be three different versions available: RS, single voltage, and dual voltage. I obviously don't want the RS. But I'm not aware what is meant by dual voltage...I don't think there has ever been a two position switch. Does it involve the number of elements?

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