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Re: ground wire for the radio
When I installed an aftermarket CD player in my 99 I purchased the connector from Wal-mart. In the connector package all of the wires are mapped by colour. Any wire you need (including ground) will be available in the harness.
If you need to you can use an ohmeter to find ground. There will be 0 ohms between the ground wire and chasiss of the vehicle.
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