Been there done that Tony. It was double checking all my wiring in the first place that led me to find the blown fuse.
The only way for a fuse to blow is to pull excess current through it. In hooking things up the only way for excess current to get routed through the fuse would be to ground (earth) the other end of the wire at the connecter while(st) the connector was hooked to +12. I can't see that happening very easily - thus my question to Hugo.
=-C
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Queue 351, Now Mk II #60000022 18gb, Blue
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Queue 351,
Mk I, 30GB
Mk II #60000022 80gb, Blue - docked
Mk2a, 80GB, Bruface, lighted buttons and dial