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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15 Reviews

Installation gear for most cars

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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. You can also call an Advisor for more information.

Scosche FGA Floating Ground Adapter Reviews

Average Customer Review:

15 reviews
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FGA

Written By Brandon, Luray, Virginia on Monday, May 11, 2015

This was installed in my 1986 Mustang GT. My factory speakers were ground to the doors, so I needed this in order to complete my wiring harness, plus having a second ground is nice.

Pros: Easy to install, compact

Cons: Nothing at all

You may think you don't need it, but you do..

Written By Scott C, New York on Thursday, May 07, 2015

Crutchfield Customer Review (What's this?)

I thought Crutchfield was pulling a fast one when they automatically added this to my cart when I was ordering a stereo and speakers for my 32 year old Ford Mustang...boy was I wrong!! I needed it and the only thing I accomplished by removing it from my cart was delaying the completion of my stereo install project by 4 days. Stupid me, I won't make that mistake again. Unit is installed and now works 100%. Thank you Crutchfield, you guys do know what is best.

Pros: Makes modern stereo systems work in older Fords.

Cons: My stupidity of removing it from the cart from the cart on the initial order, ended up having to order it anyway.

Floating ground adapter

Written By Addison, Kingston, WA on Saturday, April 25, 2015

Crutchfield Customer Review (What's this?)

This is one of the most interesting unknown products to me that I never new existed but I'm glad I found out what it is because I wouldn't have a brand new radio in my truck without it.

Pros: I now how a modern radio in my classic ford thanks to this little guy

Cons: Extremely difficult to instal I had no idea what to do with the thing took forever to figure out what to do with it

Saved my life!

Written By MG, Maryland on Monday, April 20, 2015

Crutchfield Customer Review (What's this?)

The people at Crutchfield are top notch, they certainly go above and beyond, I was ultimately frustrated with my audio project, a German made 1990 BMW 735i with a wiring harness that cannot be matched up for easy install as there is no Metra harness made for that car, and to make matters worse it is a common ground speaker system and the new aftermarket stereo's do not work with the older active amplifiers without modification (passive amps work differently). I was getting sound only out of 1 speaker (I have 10) the "floating ground adapter" allowed my factory amp to work and use all 10 speakers. They had the answer and I have great sound... the folks at Crutchfield Rock!

Pros: Great service, great products, super fast shipping

Cons: I didn't call them sooner!

Floating groud

Written By cflo, Kansas on Monday, April 20, 2015

I really dont know if this product works or not because it did not work with my application

Pros: Easy to install.

Cons: It didnt work for my application. I have the square plug. After I hooked up the floating gound adapter the final step in the instructions stated that if this vehicle had the square plug than the ground adapter would not work.

Crutchfield response on Monday, April 27, 2015 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

FGA by scosche

Written By Russ M, Michigan on Monday, March 30, 2015

Crutchfield Customer Review (What's this?)

This adaptor was exactly what I needed to get the best posssible sound out of my new stereo , and worked awesome ! I had an ungrounded speaker system in an older motor home and could not have been more happy with a product doing exactly what i wanted .

Pros: This product worked great ! I was unable to find it anywhere else .Thank goodness for the expert advice and info to try this adaptor .

Cons: Non , so far , it is working great .

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.

Hands-on research

What's in the box?

Download owner's manual

  • Floating ground adapter
  • Instructions

Product Research

Features

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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