Thanks. I figured it was a bit of a long-shot but at least worth asking.
One of my daughters has already come home for the holidays and forgot her mag-link. I didn't know how much juice actually flows through a maglink but, hoping that it might be similar to the power in Firewire that runs external hard drives, thought there might be a way to tap the Firewire power.
Can't blame a guy for trying.....at least it's not a show-stopper....daughter #2 arrives tomorrow with her Macbook and charger.
iMac (Retina 5K, 27", 2017), 3.4 GHz Intel Core i5, 8GB RAM, 2400 MHz DDR4
OS High Sierra 10.13.6
Canon MX710 Printer
Epson Perfection V500 Photo Scanner
Time Machine on 320GB OWC Mercury OTG Pro
Carbon Copy Clone on 500GB OWC Mercury OTG Pro