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PAC ADD-GM21A

Used When Replacing a Factory Amplifier or Adding an Aftermarket Amplifier in Select GM Vehicles

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• Used to add or replace factory GM amplifiers with an aftermarket amplifier
• Compatible with select 1998-2002 GM vehicles with Bose sound systems
• Used with PAC OEM-1 and AMP-RCA

See compatible vehicles Learn more about the addgm21a

Good news and a little bad...

This item has been discontinued

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PAC ADD-GM21C

OUR PRICE: $10.95

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Description


PAC brand icon

Authorized dealer

Harness Features:

  • Use this cable to add to, or replace factory GM amplifiers with an aftermarket amplifier
  • Compatible with select 1998-2002 GM vehicles
    • Also Requires PAC OEM-1 for an easy upgrade of a factory "premium" sound system
    • If replacing the the factory amplifier or adding an aftermarket amplifier, the PAC AMP-RCA will be needed
  • Authorized Internet Dealer
  • 1-year Manufacturer's warranty

Compatibility List

  • Cadillac:
    • 1999-2002 Escalade
  • Chevrolet:
    • 1998-2002 Suburban
    • 1998-2002 Tahoe
    • 1998-2002 Blazer
    • Note: The 2001-2002 Tahoe non Bose requires the PAC ADD-GM21D
  • GMC:
    • 1998-2002 Suburban
    • 1998-2002 Yukon
    • 1998-2002 Jimmy
    • 1998-2002 Envoy
    • 1998-2002 Denali

Connections:

  • Yellow – 12V Constant
  • Red – 12V Accessory
  • Black - Ground
  • Orange – Dash Light Dimmer/Illumination
  • Green – Left Rear Speaker (+)
  • Green with Black Stripe Left Rear Speaker (-)
  • White – Left Front Speaker (+)
  • White with Black Stripe – Left Front Speaker (-)
  • Purple – Right Rear Speaker (+)
  • Purple with Black Stripe – Right Rear Speaker (-)
  • Gray – Right Front Speaker (+)
  • Gray with Black Stripe – Right Front Speaker (-)

Product history:

PAC ADD-GM21C thumbnail
(newest, current model)
PAC ADD-GM21A thumbnail
(previous model, replaced by PAC ADD-GM21C)

Compatible Vehicles


Please use our Fitment Guide to determine specific compatibility for the submodel and audio features

The vehicle you have selected 2002 Volvo S40 is not compatible. Change vehicle or See list of compatible similar products


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Specifications & Details


Harness Features
Main Harness Function
Install an Aftermarket Car Amplifier & Connect to Factory Radio
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Item Details


Manufacturer:

PAC

Model Number:

ADD-GM21A

Weight:

0.50lbs

Internal SKU:

addgm21a

Internal Product ID:

16941

Customer Ratings & Reviews


PAC ADD-GM21A thumbnail image

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  • Vehicle produced after 2005: Inside driver's side door
  • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

  • You see only parts engineered for your exact vehicle
  • You avoid incompatible radios, speakers, or wiring
  • Installation is smoother, faster, and frustration-free
  • You get the correct accessories the first time

Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.