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Did that switch package come with the vehicle? Whats' the chance that it's internally converting from 48V to 12V, since you mentioned 12V lighting being powered by it. Or, it might be feeding relays that convert to 12V.
Reason being, the other two switches might not give you the volt reading you're looking for, unless you can actually get in and connect to the switch leads themselves. If you connect to some pre-existing pigtail harness, it might be sending out 12V not 48V. Easy enough to check.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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