Metra 70-1858-1 20-Pin Radio Wiring Harness for GM Vehicles

Metra 70-1858-1 is a 20-pin fully terminated radio replacement wiring harness for GM vehicles using the compatible 20-pin fully terminated radio connector. It connects an aftermarket radio to the matching factory radio plug and includes a fully terminated 6-pin section.

Key Features

• 20-pin fully terminated radio replacement wiring harness for compatible GM applications
• Includes additional fully terminated 6-pin section
• Connects to the factory radio plug for aftermarket radio installation
• Color-coded leads support standard aftermarket radio wiring
• No cutting of factory radio connectors is required

System / Wiring Notes

• Manufacturer page lists this as a GM 1988-2005 20-pin fully terminated harness, but detailed vehicle compatibility is not currently listed
• Verify exact vehicle fitment and connector style before purchase
• Additional installation parts may be required depending on vehicle and radio

Vehicle Compatibility

Installation Notes

• Confirm exact vehicle fitment, factory audio system, and radio connector before installation
• Additional parts such as a dash kit, antenna adapter, steering wheel control interface, or data interface may be required for a complete installation
• Professional installation is recommended for best results
• Check current manufacturer instructions and vehicle application data before installation

What’s in the Box

• Metra 70-1858-1 20-pin radio replacement wiring harness

Technical Specifications

• Brand: Metra
• Model: 70-1858-1
• Product Type: Radio wiring harness
• Application: GM aftermarket radio installations using the compatible 20-pin fully terminated connector
• Compatibility Type: Vehicle-specific
• Connection Type: 20-pin GM radio connector with fully terminated 6-pin section
• Speaker Support: Four-speaker connection where applicable

Identifiers & Packaging

• MPN: 70-1858-1
• UPC: 86429084623
• Sold As: Each
• Included Components: 20-pin fully terminated radio replacement wiring harness

Why Buy From MCOR Automotive

• Authorized retailer for the brands we sell
• Specialists in vehicle audio integration, radio replacement parts, and installation accessories
• 22+ years of professional automotive electronics experience
• Expert support for compatibility verification and proper setup