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My thought was fuse, but you already checked that. I would be worried about a installer who checks for power by trying to spark a hot lead against a ground. Doing something like that would blow a fuse.
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2016 Cayman S
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94 968 Cab 6 Spd. Black/Cashmere D1R SC
86.5 928 Garnet Red Metallic
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Most Pioneer stereos have a dimmer wire coming from the stereo itself that connects to the dimmer wire in the wiring harness. Maybe while checking for power he removed that wire from the harness and never reconnected it or improperly connected it. That could cause an issue like you speak of. I know it is a long shot, but still it could happen.
'93 968 coupe Black/Grey, 6 speed, 17" Factory C2 Turbo Wheels, Griemann Grills, and more once funds allow.