1. Identify the Amplifier and Speaker Wiring:
* Locate the amplifier: This is usually located in the trunk or under a seat. Consult a wiring diagram specific to your 1996 Cadillac Seville STS. A service manual would be ideal.
* Trace the speaker wires: Follow the wires from the speakers to the amplifier. You'll need to identify the positive (+) and negative (-) wires for each speaker. This is crucial. Incorrect polarity will damage your speakers.
* Identify the power wires: Locate the power, ground, and remote turn-on wires going to the amplifier.
2. Bypass the Amplifier:
* Disconnect the amplifier: Unplug all the wires from the amplifier.
* Connect the speaker wires directly to the head unit: This is the most complex part. You'll need to connect the speaker wires from the amplifier to the corresponding output channels on your head unit or a new aftermarket amplifier. The impedance of your speakers MUST match the impedance output capability of your head unit or aftermarket amp. Mixing and matching can damage the equipment.
* Head Unit Output: Many head units have speaker-level outputs which can be directly connected to the speakers. However, you'll still need to understand the speaker wiring colors. If your head unit doesn't have enough power, you'll want to use an aftermarket amplifier.
* Aftermarket Amplifier (Recommended): Using an aftermarket amplifier is generally the safer option. It provides the correct power and impedance matching for your speakers. The head unit will then send a low-level signal to the aftermarket amp. The amp will then drive the speakers appropriately.
3. Power and Ground:
* Power: You'll likely need to connect the power and ground wires directly to your car's battery. Use appropriately sized fuses to protect the circuit.
* Ground: Ensure a good ground connection to a clean metal surface on the car's chassis.
4. Remote Turn-On:
* Connect the remote turn-on wire: This wire triggers the amplifier to turn on when the head unit is turned on.
Important Considerations:
* Wiring Diagram: Obtain a wiring diagram specific to your 1996 Cadillac Seville STS. This is absolutely essential to avoid mistakes.
* Impedance Matching: Speakers have an impedance rating (usually 4 ohms or 8 ohms). Make sure the impedance of your speakers matches the output impedance of your head unit or aftermarket amplifier. Mismatched impedance can damage your equipment.
* Fuse Protection: Always use appropriate fuses to protect your circuits.
* Professional Installation: If you're not comfortable working with car electronics, it's strongly recommended to seek professional help from a car audio installer. Improper wiring can lead to damaged components and potentially electrical fires.
This process is complicated and involves working with potentially high voltages. If you are uncomfortable with this task, it's best to consult a professional. Incorrect wiring can cause significant damage to your vehicle's electrical system or result in personal injury.
