Trying to hook up a LOC to the back of a stock stereo?

Sure, here is the radio wiring diagrams and additional info for the install:

To install a line output converter (LOC) and connect an amplifier to your 2019 Kia Optima's stock radio, you will typically need to locate the wire harness at the back of the radio unit. Here are the general steps you can follow:

Remove the stock radio: You will need to refer to your vehicle's manual or find a specific guide online for the detailed steps to remove the radio. This may involve removing trim panels and using special tools like radio removal keys.

Locate the wire harness: Once the radio is removed, you should be able to see the wire harness connected to the back of the radio unit. It usually consists of a large connector with multiple wires.

Identify the necessary wires: To tap into the audio signal, you'll need to identify the appropriate wires for the speaker outputs. Each wire should have a corresponding color code, which can vary depending on the vehicle's make and model. In some cases, you may need a wiring diagram specifically for your vehicle to identify the correct wires. You can try searching online for a wiring diagram or consult a service manual for your Kia Optima.

Connect the LOC: Once you've identified the speaker wires, you can use a line output converter (LOC) to tap into the audio signal. The LOC typically has input wires that you connect to the speaker wires and output wires that you connect to your amplifier.

Check out the images (below). Please let us know what happens.