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Scosche FGA Floating Ground Adapter

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

24 Reviews | 1 question - 1 answer

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Item # 142FGA

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Our take on the Scosche FGA Floating Ground Adapter

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.

Worked perfectly easy hookup

85F150, Stockbridge, GA

What's in the Box:

  • Floating ground adapter
  • Instructions

Scosche FGA Floating Ground Adapter Reviews

Average Customer Review(s):

(24 Reviews)

Scosche FGA Floating Ground Adapter

Crutchfield customer from Bonner Springs, KS on 8/20/2018

1992 Ford E Series
Crutchfield Customer Review (What's this?)

Worked on 92 e350 rv. Right rear ground color code used for adapter for all grounds.

Pros: Straight forward

Cons: None for me. People talk of freq limits but most new radios have eq settings so compensate for transformers on factory wiring. If ur that picky run additional grounds.

Scosche FGA Floating Ground Adapter

Crutchfield customer from Madisonville, TN on 7/22/2018

1979 Lincoln Mark V
Crutchfield Customer Review (What's this?)




Scosche FGA Floating Ground Adapter

Crutchfield customer from Eastlake, OH on 5/8/2018

1980 Ford Thunderbird
Crutchfield Customer Review (What's this?)

Worked perfectly, was exactly what needed to complete install



Scosche FGA Floating Ground Adapter

85F150 from Stockbridge, GA on 9/1/2016

1985 Ford F Series
Crutchfield Customer Review (What's this?)

Worked perfectly easy hookup

Pros: Great part

Cons: None

Scosche FGA Floating Ground Adapter

Warren from Port Saint Lucie, FL on 8/16/2016

1983 Lincoln Mark VI
Crutchfield Customer Review (What's this?)

Works great. Needed to put mOdern radio in 83 Lincoln Mark. Directions are nOt to useful thOugh, only front run through the adapter, rears are wired conventionally or they won't . Ford had weird floating ground on fronts Only.

Pros: Wos good

Cons: Directions

Contemporary Sound

Judge J from Dallas, TX on 7/28/2016

1977 Lincoln Mark V
Crutchfield Customer Review (What's this?)

An essential component of having a contemporary sound system in a vehicle 39 years old.

Pros: Ease of installation


It worked!

DS from Richmond, VA on 6/14/2016

1986 Volkswagen Vanagon
Crutchfield Customer Review (What's this?)

Bought the FGA to correct an odd wiring design in my Vanagon in which the two rear speakers share a common ground, which made the receiver distort and anything above moderate listening levels. I used this device to put all four speakers and the receiver chassis on the same (chassis) ground, and to my amazement this corrected the problem and allowed the receiver to put out full power without distortion.

Pros: Does what it is supposed to do, when used 'intelligently' (some knowledge of electronics is helpful!).

Cons: Instruction sheet is of little use.

Scosche FGA Floating Ground Adapter

Kevin from Homestead, FL on 5/15/2016

1974 Ford Bronco
Crutchfield Customer Review (What's this?)

works great



Scosche FGA Floating Ground Adapter

Les from Minneapolis, MN on 4/7/2016

1975 Ford Mustang
Crutchfield Customer Review (What's this?)

Does just what its supposed to do.

Pros: Small, easy to use

Cons: None


Brandon from Luray, Virginia on 5/11/2015

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..

Scott C from New York on 5/7/2015

1983 Ford Mustang
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

Addison from Kingston, WA on 4/25/2015

1977 Ford F Series
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!

MG from Maryland on 4/20/2015

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

cflo from Kansas on 4/20/2015

1986 Ford F Series
Crutchfield Customer Review (What's this?)

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 4/27/2015 We forwarded this review to our Technical Support team for follow-up. Lifetime tech support comes with every Crutchfield purchase.

FGA by scosche

Russ M from Michigan on 3/30/2015

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

dualdj1 from Illinois on 2/10/2015

1987 Ford Econoline
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

Ryan M from Ohio on 2/2/2015

1988 Nissan 300ZX
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

S from the Washington, DC Area on 12/23/2014

1988 BMW 325I
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

Primo from Massachusetts on 11/30/2014

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

RyanM from Philadelphia, PA on 11/19/2014

1988 BMW 325I
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

medericus from Fort Smith, AR on 10/29/2014

1988 BMW 635CSI
Crutchfield Customer Review (What's this?)

Product works as advertized. Very easy to install.



Scosche FGA Floating Ground Adapter

Barry from Prescott Valley, AZ on 9/27/2014

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

Ben from Port Richey, FL on 5/17/2014

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

Geoff W. from San Antonio, Tx. on 4/2/2014

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 4/7/2014 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

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.

Our Product Research Team

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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

I wanted to properly ground my new radio, and a good quality adapter is very hard to find but is a must. CrutchField Came in clutch [ Dakota Chase  Feb 16, 2019 ]
Just in case I need it [ Craig  Oct 07, 2018 ]
1987 BMW 325is [ Jorge  Aug 29, 2018 ]
was Included [ Brian  Aug 20, 2018 ]
BMW E 34 chassis speakers are grounded through the factory amp [ Alan  Aug 11, 2018 ]
I chose this because I do not have detailed design specifications on the Car Stereo. Because it was offered free and I don't know that I won't need it, I added it to my cart. [ Bob  Jul 17, 2018 ]
Eliminate electrical noise over aux connections. [ Josh S  Jul 14, 2018 ]
Recommended by your sytem [ Christopher  Jul 10, 2018 ]
Included with purchase for installation [ Morgan  Jul 02, 2018 ]
Adam recommended. [ Patrick  May 22, 2018 ]
needed it for my car [ ron  Apr 24, 2018 ]
Cause I heard good things about it [ Jaylen  Apr 13, 2018 ]
just in case i need it. [ edward  Mar 26, 2018 ]
Need. [ Richard  Mar 01, 2018 ]
It was free [ Leia  Feb 10, 2018 ]
I didn't choose it. It came with the stereo for free. [ Brad  Nov 28, 2017 ]
Weekend sale, researched items and they seem to be top notch [ Thomas  Nov 24, 2017 ]
included with the deal [ Steve  Nov 10, 2017 ]
Recommended by your website [ Gary  Oct 09, 2017 ]
Recommended. Probably won't end up using, but doesn't hurt to have. [ Michael  Aug 08, 2017 ]
I've used SO speakers in my 1978 Ford E150 Van and I'm very happy with their performance. No need to break the bank as these speakers fit any budget while delivering much more than you'd expect for the price. They look nice too! [ Chris  Jun 21, 2017 ]
It was part of the suggested/required items to allow the radio I purchased to work with the original speakers and wiring. [ Dave  May 25, 2017 ]
Need [ Zachary  May 23, 2017 ]
Your company makes it very easy to get all the necessary information [ steve  May 12, 2017 ]
came with installation package [ Kurt  Feb 22, 2017 ]
included [ Michael  Jan 22, 2017 ]
Crutchfield recommendation [ Carlos  Jan 04, 2017 ]
I have an older car and want to upgrade the sound system in it. This product makes the conversion with no altering of the factory wire harness [ John  Dec 27, 2016 ]
It was recommended. [ George  Nov 24, 2016 ]
Package deal [ Bob   Oct 28, 2016 ]
Included in kit for free [ Charles P.  Oct 10, 2016 ]
To go with the radio [ Carlos  Aug 30, 2016 ]
It had great reviews. [ Steve  Aug 28, 2016 ]
Old vehicles helps restrict feedback static with neg grounded vehicle [ Greg  May 26, 2016 ]
Because I got help on Chat line with Crutchfield representative [ Rod  Mar 05, 2016 ]

1 question already asked

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. [ Krissy  Jun 08, 2018 ]  Staff

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