Metra 70-1862 GM 21-Pin Radio to GM 12-Pin Adapter Harness

Metra 70-1862 is a GM 21-pin to GM 12-pin radio adapter harness for GM radio wiring adapter applications using a 21-pin radio to 12-pin vehicle connection. It is used when the installation requires adapting a GM 21-pin radio connection to a GM 12-pin connection.

At a Glance

• GM 21-pin radio to GM 12-pin adapter harness
• Application-specific adapter for compatible GM radio wiring installations
• Supports cleaner connection when the matching GM connectors are present
• Helps avoid cutting factory wiring when used in the correct application
• Use current fitment data or installer verification before purchase

System / Wiring Notes

• Manufacturer vehicle compatibility is not currently listed for this part
• Verify connector style, radio type, and vehicle application before installation
• This is an adapter harness, not a complete dash kit or feature-retention interface

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 70-1862 GM radio adapter harness

Technical Specifications

• Brand: Metra
• Model: 70-1862
• Product Type: Radio adapter harness
• Application: GM 21-pin radio to GM 12-pin adapter harness applications
• Compatibility Type: Application-specific
• Connection Type: GM 21-pin radio to GM 12-pin adapter
• Vehicle Fitment: Verify by connector and current manufacturer fitment data

Identifiers & Packaging

• MPN: 70-1862
• UPC: 086429003556
• Sold As: Each
• Included Components: GM radio adapter 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