Scosche FGA Floating Ground Adapter

Connect a new car stereo in select older (pre-1995) vehicles with a common ground speaker system

Item #: 142FGA

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9 Reviews

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Add a high-power car stereo to your older Ford vehicle

You'd like to install a new stereo in your older vehicle, but your factory system was designed for a low-power radio with speakers that share a negative ground connection. Scosche's FGA floating ground adapter compensates for this setup, allowing you to connect your new stereo safely. You'll also enjoy your new stereo's higher power. Warranty: 1 year

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Hands-on research

What's in the box?

Download owner's manual

  • Floating ground adapter
  • Instructions

Product Research


Floating Ground Adapter: The Scosche Floating Ground Adapter (FGAB) lets you install a high-power aftermarket stereo into many older 70s, 80s, 90s vehicles with a common ground or premium sound 5-wire speaker system.

Wire Code Chart:

Wire Color Function
White Left Front Speaker +
White/Black Left Front Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -
Black Ground
Note:  Please consult the Crutchfield Car Selector for your vehicle's compatibility.

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At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Scosche FGA Floating Ground Adapter Reviews

Average Customer Review:

9 reviews
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Great for older vehicles

Written By dualdj1, Illinois on Tuesday, February 10, 2015

Crutchfield Customer Review (What's this?)

Great, easy, and cheap way to attach newer stereos to older floating ground systems.

Pros: Good instructions, easy to connect. cheap

Cons: none

Scosche FGA Floating Ground Adapter

Written By Ryan M, Ohio on Monday, February 02, 2015

Crutchfield Customer Review (What's this?)

Fantastic sound. Not really clear on what constitutes the need for this addition, but it works perfectly.

Pros: Works great. No issues.

Cons: A bit confusing as to why it is needed. And why only one speaker is to be connected to the exiting negative? Regardless, it functions perfectly

Scosche FGA Floating Ground Adapter

Written By S, the Washington, DC Area on Tuesday, December 23, 2014

Crutchfield Customer Review (What's this?)

While restoring a BMW E30, I was able to test the system with and without the adapter. The FGA works well and didn't seem to detract from the sound quality of my radio. It was useful by saving me the trouble of permanently rewiring the sound system to include separate grounds for each speaker output.

Pros: It works well.

Cons: 1) Poor documentation. 2) Implies that it is only for Ford systems. 3) The wiring color code was the opposite of my car's color code. That is the polarity of the solid and striped wires were opposite (same Color but, Stripe to Solid and Solid to Stripe). This made the job a bit tedious because I had to double check each connection and some were difficult to see the stripe on the wires through the dash cutout.

Scosche FGA Floating Ground Adapter

Written By Primo, Massachusetts on Sunday, November 30, 2014

Crutchfield Customer Review (What's this?)

This floating ground adapter was just the thing I needed to finish the install of a new head unit in an old classic car (1980 Chrysler) with a common ground. It works flawlessly and made the install much faster and easier than running all new wiring through the car!!!

Pros: fast and easy to install and works well.

Cons: none

Exactly what I needed

Written By RyanM, Philadelphia, PA on Wednesday, November 19, 2014

Crutchfield Customer Review (What's this?)

I used this for a new stereo in my BMW E30 with a common ground. It works flawlessly and made my install easy as could be.

Pros: Works perfectly in my E30 with a 6 speaker system.

Cons: None

Works Like A Charm

Written By medericus, Fort Smith, AR on Wednesday, October 29, 2014

Crutchfield Customer Review (What's this?)

Product works as advertized. Very easy to install.

Scosche FGA Floating Ground Adapter

Written By Barry, Prescott Valley, AZ on Saturday, September 27, 2014

Crutchfield Customer Review (What's this?)

This adaptor is required to connect any isolated-ground radio to any common-ground car without needing to run new speaker wiring to eliminate any common or chassis grounds. This applies to almost all 60's and 70's classic cars with the exception of the later Delco systems which are easily identified by their 3 piece blue, white and black connectors. It's not only needed for Ford cars as a customer "suggests"; it also applies to earlier GM of any model, Ford, Chrysler, AMC and any foreign cars that use a common negative ground system.

The stock 300zx indeed uses a common ground system for the stereo. Sure, an isolated ground radio might "work" without the adaptor, but is very likely to overheat the output section, reduce the amount of available power and shorten its life.

Crutchfield makes it extremely clear that "service after the sale" is just as important as the sale itself.

I'm not affiliated with Crutchfield - just a car radio repair guy who is fed up with folks who cost us money through their lack of knowledge.

Works as advertised

Written By Ben, Port Richey, FL on Saturday, May 17, 2014

Crutchfield Customer Review (What's this?)

I have a common negative ground speaker system in a 1993 Winnebago. I changed the head unit and needed this to use existing speaker wires. Works well..

Pros: Works Great. Without it I could not use the negative common ground speaker system.

Cons: none

Not needed at all

Written By Geoff W., San Antonio, Tx. on Wednesday, April 02, 2014

Crutchfield Customer Review (What's this?)

Was told I "needed" this product to connect my new stereo with the old 300ZX wiring. Wrong!! Waste of money. It is sitting on my desk as a paperweight. Not worth the effort to return an item that cost this much. Like I said, waste of money. Only needed if you own a Ford vehicle, so don't fall for the "any older vehicle" line.

Crutchfield response on Monday, April 07, 2014 This car's stereo system was probably rewired at some time in the past, which would explain why he didn't need this adapter. When we read Geoff's review, we promptly refunded him the charge for the item since it wasn't needed.

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