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Metra 40-GM20 Antenna Adapter

Works with select 1985-up General Motors vehicles — factory male to female Motorola antenna connector

Item #: 12040GM20

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7 Reviews | Ask Questions

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Metra 40-GM20 adapter

The Metra 40-GM20 adapter lets you connect an aftermarket antenna cable to the factory radio. It has an OEM male plug on one end and a Motorola female jack on the other. You'll also need item 12040GM10 if you're installing a wired FM modulator with your factory radio. Please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this adapter is compatible with your vehicle. Warranty: 60 days.

Metra 40-GM20 Antenna Adapter Reviews

Average Customer Review:

7 Reviews

Metra 40-GM20 Antenna Adapter

Written by: JimR from Mission Viejo, Ca on June 21, 2014

Crutchfield Customer Review (What's this?)

Everything I have purchased has been as described.

Pros: Had in stock and received in a timely fashion. Great service.

Cons: none

Antenna Adapter

Written by: thedudeabides80 from Mount Sterling IL on May 4, 2014

Crutchfield Customer Review (What's this?)

The price was nice and the quality of the product was great. BUT I was installing this in a 94 olds cutlass supreme and the factory antennae wire has a bend in it and would not fit correctly into this adapter, I had to go guy another adapter to fit into this one which fit into the stereo just fine, If your antennae wire has the factory bent end on the wire I would explore other options.

Pros: Great quality, price

Cons: will not accept factory bend antenna wire.

Metra 40-GM20 Antenna Adapter

Written by: TX454SS from Houston, TX on May 2, 2014

Crutchfield Customer Review (What's this?)

This adapter quickly and easily connected the OEM antenna coax in my 1990 Chevy 1500 to my newly installed Sony sound system.

Pros: Quick and easy

Cons: None

Of course it fits

Written by: Cookie from MA. on December 7, 2013

2006 Chevrolet Cobalt
Crutchfield Customer Review (What's this?)

As with everything I purchase from Crutchfield, it is just the right part.

Pros:

Cons:

Adapter worked great with auxilary fm input unit...very pleased

Written by: Charles from Jeffersonville,In. on July 29, 2013

2006 Buick LaCrosse
Crutchfield Customer Review (What's this?)

Adapter worked great with auxilary fm input unit...very pleased. Super support!

Pros: easy install

Cons: none

Just what I needed

Written by: Charlie from Hagerstown,Maryland on April 25, 2009

1989 Chevrolet C Series
Crutchfield Customer Review (What's this?)

Did just what it was made for.

Pros:

Cons:

Just right

Written by: Charles from Sacramento, CA on February 17, 2009

1998 Cadillac Eldorado
Crutchfield Customer Review (What's this?)

This piece of cable did exactly what it was made to do.

Pros:

Cons:

Hands-on research

What's in the box?

Download owner's manual

  • GM antenna adapter cable

Product Research

Features

Compatibility: The Metra AntennaWorks GM antenna adapter cable (40-GM20) converts the mini "barbed" or "barbless" antenna plug of a 1985-up GM factory radio to a standard motorola connection for installation of an aftermarket antenna in select 1985-up GM vehicles.

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