The wire coming from the fuse box for radio will be yellow. You should see a connector with three wires under the dash (actually 90% of these connectors have been cut off). Yellow for power, black for ground and grey for dash lights.
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Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)
My 70SS
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Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)
My 70SS