I had the same a while ago with my 2005 roadster. Turned out lots of the electrics had been put through the first fuse, I think its called the ignition fuse, If I remember it was a 20A one, the first in the box. I temporarily put a 30A in but didnt risk turning the heater on again until I got it sorted. My Morgan garage (Life's at Stockport) arranged for the high draining items to be wired separately on their own / different fuses. For info mine blew (ground to a halt) when I had, heated front windscreen, heated seat, lights, heater and obvs engine all turned on, I cant remember which was the last I turned on that blew it Im afraid.
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