XenonZcar.com - 280ZX Aftermarket Stereo Installation FAQ
Installing a different stereo in a Z can be a very difficult thing to do. As it is a classic car, You cannot just go buy an adapter kit and connect some wires and go. Here we will answer some common questions about this process.
One of the other difficult problems to solve is getting the head unit to fit securely in the early model Z's. The opening is large enough, but you'll have to be resourceful if you want a tight fit and a theft-resistant installation. There's also the issue of the very large opening in the dash that remains when the factory unit is removed. On the 1981 models, the original unit was at least designed with the radio and the cassette deck side-by-side. A mounting plate is available from Motorsport Auto.
⚠️ Warning:
This may seem like a simple and straightforward procedure, however, there is always the possibility of error, and you are responsible for any damage you cause by attempting this procedure yourself.
280ZX Speakers Wiring and Mounting
Unfortunately, you can't fit larger speakers than the original 5 1/4" in the rear panels without cutting metal. These speakers don't face the driver or passenger, so you won’t get much high-end response—just mid-range and some bass tones. Essentially, the limitation comes from the speakers themselves, not the radio. You can install any stereo you like, but with factory speakers, the difference will be minimal.
One option is to remove the “pockets” where the seats would be on the 2+2 model and mount 6x9 speakers there. They fit well, but you may lose high-end response since they face upward. Because they’re close to the seats, there might be an ongoing battle over the balance control. Another option is pairing 6x9s (for bass) with mid-range satellite speakers on or near the shock towers. A custom speaker box in the rear would give the best sound, but at the cost of space.
If you’re avoiding cutting metal, 6 1/2" speakers are a good choice—they fit easily and allow you to reuse the original grilles by mounting them behind the panel.
Note: The following wiring information assumes your S130 hasn’t been altered by “creative” stereo installers or wildlife with a taste for copper wire.
Front Right Speaker
- Positive: Blue with Red Stripe
- Negative: Blue with Black Stripe (Right common ground)
Front Left Speaker
- Positive: Yellow with Red Stripe
- Negative: Yellow with Black Stripe (Left common ground)
Right Rear Speaker
- Positive: White
- Negative: Blue with Black Stripe
Left Rear Speaker
- Positive: Blue-Green with White Stripe (Double-check at factory speaker connection)
- Negative: Yellow with Black Stripe
280ZX Head Unit Wiring and Mounting
One of the other difficult problems to solve is getting the head unit to fit securely in the early model Z's. The opening is large enough, but you'll have to be resourceful if you want a tight fit and a theft-resistant installation. There's also the issue of the very large opening in the dash that remains when the factory unit is removed. On the 1981 models, the original unit was at least designed with the radio and the cassette deck side-by-side. A mounting plate is available from Motorsport Auto.
280ZX Basic Stereo Wiring Colors
| Function | Wire Color |
|---|---|
| Constant 12V+ | Red/Black |
| Switched 12V+ | Blue |
| Ground | Must run new to chassis Ground |
| Illumination | Red/Yellow |
| Dimmer | n/a You can run a tap off the headlamp switch for parking lamps |
