About the Metra 70-1786 Receiver Wiring Harness
Metra 70-1786 Receiver Wiring Harness
Metra 70-1786 Receiver Wiring Harness
Installation Note: This harness uses your factory amplifier; your new stereo must have two pairs of preamp outputs to connect this harness.
This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.
First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.
Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness makes installing your new stereo easier, and allows you to put the factory radio back when you sell your vehicle or return it at the end of the lease. A detailed instruction sheet comes with the harness. Warranty: 60 days.
Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.
What's in the box:
Metra 70-1786 Receiver Wiring Harness owner's manual
- Receiver wiring harness
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Features
Crutchfield Wiring Harness: Crutchfield wiring harnesses prevent you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the Crutchfield wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the Crutchfield wiring harness into your vehicle's factory radio plug.
Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.
Wiring Notes: If the Crutchfield wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional adapter is required & sold separately.
Wire Code Chart:
| Wire Color | Function |
| Red | +12 Volt Accessory |
| Yellow | +12 Volt Constant |
| Black | Ground |
| Blue/White | Amp Turn-On |
| Orange/White | Dimmer |
| White RCA | Left Front Channel |
| Gray RCA | Right Front Channel |
| Green RCA | Left Rear Channel |
| Violet RCA | Right Rear Channel |
Factory Amp Note: This harness includes RCA connections (instead of speaker wire leads) to connect the aftermarket head unit's preamp outputs to your vehicle's factory amp. Your aftermarket head unit must be equipped with front & rear preamp outputs.
The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.
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Customer Q&A
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One of the best things about Crutchfield is supplying a harness such as this one with the purchase of a head unit. Harness was perfect to allow use of the Bose amplifier without needing to read a wiring diagram to splice everything in place. Thanks for saving me a lot of anguish.
Glenn from Durham