Thunderbolt to FireWire Adapter: no bus power?

I got my TB to FW adapter yesterday and it worked fine with a HD using wall power but will not power a portable Iomega drive via the FW bus only. The drive light will flash once every few seconds so some power is going through, but not enough to spin up and mount the drive. Normally the light is constantly on when working.
Also the adapter will not power my MOTU Ultralite Hybrid via FireWire, but it works fine powered via the wall.
Has anyone else had this issue?

Thanks for the reply. I think i just have rotten luck because i just tried an old FireLite drive and it works fine. So now all we need is a database that lists what drives work on bus power with the adapter.

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