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Metra

Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005

Metra 70-1858 21-Pin Radio Wiring Harness for Select GM Vehicles 1986-2005

$14.99 USD
$14.99 USD
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Metra 70-1858 is a 21-pin radio replacement wiring harness for select GM vehicles from 1986-2005. It connects an aftermarket radio to the factory radio plug for cleaner power and speaker wiring connections.

Key Features

  • 21-pin radio replacement wiring harness for select GM vehicles
  • Connects to the factory radio plug for aftermarket radio installation
  • Color-coded leads support standard aftermarket radio wiring
  • Provides electrical power and four-speaker connections where applicable
  • 5-inch harness length for compact radio wiring connection

System / Wiring Notes

  • Large GM fitment range; verify exact year, model, trim, and connector before installation
  • Additional data interface may be required to retain chimes, steering wheel controls, or other factory features
  • This harness does not replace any required dash kit or antenna adapter

Vehicle Compatibility

Make Model Years
Buick Century / Electra / LeSabre / Park Avenue / Riviera / Roadmaster / Skyhawk / Skylark 1986-1996
Cadillac 60 Special / DeVille / Eldorado / Escalade / Escalade EXT / Seville 1988-2002
Chevrolet Astro / Avalanche / Beretta / Blazer / Camaro / Caprice / Express / S10 / Silverado / Suburban / Tahoe / Venture 1988-2005
GMC C/K Series / Jimmy / Safari / Savana / Sierra / Sonoma / Yukon / Yukon XL 1988-2005
Isuzu Hombre 1996-2000
Oldsmobile 88 / 98 / Achieva / Bravada / Cutlass / Silhouette / Toronado 1988-1999
Pontiac 6000 / Bonneville / Firebird / Grand Am / Grand Prix / Montana / Sunfire / Trans Sport 1988-2003
Saturn SC / SC1 / SC2 / SL / SL1 / SL2 / SW1 / SW2 1991-2002

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 21-pin radio replacement wiring harness

Technical Specifications

  • Brand: Metra
  • Model: 70-1858
  • Product Type: Radio wiring harness
  • Application: Select Buick, Cadillac, Chevrolet, GMC, Isuzu, Oldsmobile, Pontiac, and Saturn aftermarket radio installations using the compatible 21-pin connector
  • Compatibility Type: Vehicle-specific
  • Connection Type: 21-pin GM radio connector
  • Harness Length: 5 inches
  • Speaker Support: Four-speaker connection where applicable

Identifiers & Packaging

  • MPN: 70-1858
  • UPC: 86429002573
  • Sold As: Each
  • Included Components: 21-pin 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
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