Keep looking. If there was 12V there was a fuse in the line somewhere. If you short directly to ground you blew a fuse. Now there is no 12V because you blew the fuse. If you keep looking you will find it.
Another option is to trace the 12V wire all the way back to the fuse box/panel.
It may also be to just google wiring colors for that vehicle or look it up in a Hayne's manual. Either way, you just need to keep looking.
1998 Ford Windstar Stereo Wiring
Constant 12V+ Green/Purple
Switched 12V+ Yellow/Black
Ground Black/Light Green
Illumination Green
Dimmer n/a
Antenna Trigger n/a
Antenna Right Front
Front Speakers 5" x 7" Doors
Left Front (+) Orange/Light Green
Left Front (-) Light Blue/White
Right Front (+) White/Light Green
Right Front (-) Dark Green/Orange
Rear Speakers 5" x 7" Side Panels
Left Rear (+) Light Brown/White
Left Rear (-) Light Brown/Yellow
Right Rear (+) Light Brown/Green
Right Rear (-) Brown/Pink
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