Our Workhorse had no connection to the 12 Volt pin on the 7 way connector. I doubt that any of them were setup with the 12 Volt power on the connector. I simply ran a #10 wire fused with a 30 amp fuse from the 12 volt main pin on our rear mounted Onan genny. Works fine and keeps the toad charged without pulling any fuses.
-- On edit, having switched to a Volt on a dolly now I no longer need the 12 Volt for the toad. Such is life as things change constantly.... :) Love the Volt, but the dolly towing is a bit of a bother. :) I knew it would be a bother, but the Volt is worth the effort. Haven't bought any gas for it since I took delivery on 4/19/2013. That rocks.... :)