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PAC ADD-GM21C

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

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• Add/Replace Factory GM Amplifiers With Aftermarket Amplifier
• Compatible With Select 1998-2003 GM Vehicles With Bose Sound Systems
• Used With PAC OEM-1 and AMP-RCA

Learn more about the addgm21c

We apologize

This item has been discontinued


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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 - 2003 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

  • Chevrolet:
    • 1998-2002 Camaro (with Monsoon)
  • Pontiac:
    • 1998-2002 Firebird (with Monsoon)
    • 1999 Bonneville
    • 2000-2003 Grand Prix

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)

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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-GM21C

Weight:

0.25lbs

Internal SKU:

addgm21c

Internal Product ID:

17697

Customer Ratings & Reviews


PAC ADD-GM21C thumbnail image

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  • Owner's manual
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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.