Here are the general steps involved in using a speaker wire harness to connect a new aftermarket radio:
Locate the speaker wire harness for your vehicle. This harness will typically be located behind the car's dashboard or in the trunk.
Match the wires on the speaker wire harness to the corresponding wires on the new radio. The colors of the wires will usually match, but you can also refer to the wiring diagram for your vehicle's specific radio.
Connect the wires by twisting them together and then crimping them with a pair of pliers or using crimp connectors.
Once all of the wires are connected, you can mount the new radio in the dashboard and turn it on.
Test the radio to make sure that all of the speakers are working properly.
It's important to note that some vehicles may have a different speaker wire configuration, so it's always a good idea to consult the wiring diagram for your vehicle before attempting to connect a new radio. Additionally, some aftermarket radios may require additional wiring or adapters to function properly, so be sure to check the instructions for your specific radio.