Should be 24 VDC. It can be tested real easy with a voltmeter. I can't verify that for sure but that's the way most of them work. What are you trying to utilize it for? Most USB connected devices will work with the higher voltage as long as you use the USB connector.
http://www.aircraftspruce.com/pages/...er13-15538.php
or the TSO'd version
http://www.aircraftspruce.com/catalo...11-13345-6.php
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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