Need a ground wire

by Alan
(Lancaster)

I have a 1978 Corvette and put a 700R4 transmission in it. It has a switch on the center console. the hot wire is connected to the fuse bos next to the fuse for the radio. The switch needs to be attached to a good ground. It is currently attached to a bracket in the center console(not a good ground), but that causes my radio to turn off when I put the transmission switch to the "on " position and the speed reaches 45-50 mph. The harness for the rear window defogger is there and there is a black wire in it. Is that possibly a ground wire to which I can connect the transmission switch?

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