C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

C4 stereo wiring harness adapter

Thread Tools
 
Search this Thread
 
Old Sep 19, 2019 | 04:45 PM
  #1  
TheGreek!'s Avatar
TheGreek!
Thread Starter
Pro
 
Joined: Apr 2016
Posts: 512
Likes: 62
Default C4 stereo wiring harness adapter

I want to put a nice stereo in my 96 (it has the Bose gold system) but I can't seem to find the correct adapter harness for the wiring. I do NOT want to cut the factory stereo wiring, I want to use an adapter harness if at all possible. Are they available? If so who makes it and where can I get it? Any help is appreciated.
Reply
Old Sep 19, 2019 | 04:55 PM
  #2  
vette196's Avatar
vette196
Melting Slicks
10 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2015
Posts: 2,069
Likes: 262
From: Park Ridge New Jersey
Default

Try crutchfield
Reply
Old Sep 20, 2019 | 06:37 AM
  #3  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

https://www.crutchfield.com/S-Qdo9DO...s-Harness.html

http://www.metraonline.com/part/Afte...arness_70-1857

The wiring instructions from Metra are not 100% clear regarding the ground wire(s). Even the folks at Crutchfield screwed up and wired the grounds all together (for my particular radio), instead of going to ground. The grounds need connected and grounded of course.
Reply
Old Sep 20, 2019 | 02:50 PM
  #4  
TheGreek!'s Avatar
TheGreek!
Thread Starter
Pro
 
Joined: Apr 2016
Posts: 512
Likes: 62
Default

Originally Posted by drcook
https://www.crutchfield.com/S-Qdo9DO...s-Harness.html

http://www.metraonline.com/part/Afte...arness_70-1857

The wiring instructions from Metra are not 100% clear regarding the ground wire(s). Even the folks at Crutchfield screwed up and wired the grounds all together (for my particular radio), instead of going to ground. The grounds need connected and grounded of course.
Thanks for the info. I went ahead and ordered the metra harness from crutchfield. The one on metra's website doesn't give you an option to buy it, there was no price and no "add to cart" button in the link. By the way, I was reading the reviews on it and a lot of people we're saying that it works great except when you turn the radio on you'll hear a "pop" noise from the speakers. One of the reviews thankfully had the solution, you need to also get two ground loop noise isolators to correct that problem and he gave the crutchfield part number for them so I bought those too to go with the harness. Here is the link for the ground loop isolators from crutchfield:

https://www.crutchfield.com/p_127SNI...mnews=15689488

Now all I need to do is decide what kind of stereo I want to get for the car...

Last edited by TheGreek!; Sep 20, 2019 at 02:58 PM.
Reply
Old Sep 20, 2019 | 02:59 PM
  #5  
FASTAZU's Avatar
FASTAZU
Race Director
20 Year Member
Veteran: Navy
Community Favorite
Top Answer: 3
 
Joined: Feb 2002
Posts: 11,618
Likes: 1,055
From: Compound in the Grove, Ga.
2026 Corvette of the Year Finalist - Unmodified
2025 C4 of the Year Winner - Unmodified
2024 C4 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
2019 C4 of Year Finalist (performance mods)
2018 C4 of Year Finalist
2015 C4 of the Year Finalist
St. Jude Donor '16
Default

Crutchfield has some great options including an Apply-play touch screen that will fit the C4 opening. Do a search here on it just read about someone installing one.

https://www.corvetteforum.com/forums...4-96-trim.html

Last edited by FASTAZU; Sep 20, 2019 at 03:04 PM.
Reply
Old Sep 20, 2019 | 03:00 PM
  #6  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

I put the Metra link there because it has their instructions on how to wire it.

If you do a search on me, you will find my thread on installing a backup camera and there is a solution to the "thump". PAC SNI-1's. You will need 2. Front L & R Rear L & R.

Also in my recent threads I posted how to keep your antenna from lifting as soon as you turn the car on, NOT THE Radio, the car. You will also need to leave the old BOSE unit behind the back seat. There are functions that still go through it, at least in the way that Crutchfield wired the adapter there is.

In the 96's, there is the relay next to the radio behind the back seat. There are 2 green wires that come off the relay. The one that goes back towards the back of the car, you put a toggle switch in it and you can control the antenna.
Reply
Old Sep 20, 2019 | 03:07 PM
  #7  
TheGreek!'s Avatar
TheGreek!
Thread Starter
Pro
 
Joined: Apr 2016
Posts: 512
Likes: 62
Default

Originally Posted by drcook
I put the Metra link there because it has their instructions on how to wire it.

If you do a search on me, you will find my thread on installing a backup camera and there is a solution to the "thump". PAC SNI-1's. You will need 2. Front L & R Rear L & R.

Also in my recent threads I posted how to keep your antenna from lifting as soon as you turn the car on, NOT THE Radio, the car. You will also need to leave the old BOSE unit behind the back seat. There are functions that still go through it, at least in the way that Crutchfield wired the adapter there is.

In the 96's, there is the relay next to the radio behind the back seat. There are 2 green wires that come off the relay. The one that goes back towards the back of the car, you put a toggle switch in it and you can control the antenna.
Yes, I bought two SNI-1 ground loop noise isolators to go with the harness. Can you post a link to the thread(s) you made about the antenna and any other things regarding doing a sterero install correctly? By the way, is there any way to make the radio control the antenna instead of having to mount a separate toggle switch for it? I would really like the radio to control it if at all possible.
Reply
Old Sep 20, 2019 | 04:33 PM
  #8  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

https://www.corvetteforum.com/forums...up-camera.html

I added Sirius XM Radio. I am really satisfied with the Sony radio I bought.

As I said in the write-up, with the particular radio I bought, there is enough room without having to cutup any of the structure in the dash to fit it.

Did you get an extension for the antenna lead ? It is also behind the back seat.

I could find no way to have the radio control the antenna as the radio unit powers up as soon as the car is turned on (or ACC) (how it was wired). It is no big deal to reach behind the passenger seat and flip the toggle switch. That is where I put it, in the tray. I added some wire to give me enough room.

Maybe you can wire it differently but going by the instructions and the wiring to the Sony radio, there wasn't.

If you take the car through a car wash (I don't) you will be glad you can control the antenna.

Last edited by drcook; Sep 20, 2019 at 04:40 PM.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Sep 20, 2019 | 06:57 PM
  #9  
TheGreek!'s Avatar
TheGreek!
Thread Starter
Pro
 
Joined: Apr 2016
Posts: 512
Likes: 62
Default

Originally Posted by drcook
https://www.corvetteforum.com/forums...up-camera.html

I added Sirius XM Radio. I am really satisfied with the Sony radio I bought.

As I said in the write-up, with the particular radio I bought, there is enough room without having to cutup any of the structure in the dash to fit it.

Did you get an extension for the antenna lead ? It is also behind the back seat.

I could find no way to have the radio control the antenna as the radio unit powers up as soon as the car is turned on (or ACC) (how it was wired). It is no big deal to reach behind the passenger seat and flip the toggle switch. That is where I put it, in the tray. I added some wire to give me enough room.

Maybe you can wire it differently but going by the instructions and the wiring to the Sony radio, there wasn't.

If you take the car through a car wash (I don't) you will be glad you can control the antenna.
No worries about damage from taking it through a car wash, I do my own car washing. Does your Sony have a USB port in the front of it? I want a stereo (double din size) that has one because I want it to be able to play mp3's from a USB memory stick. It also has to be able to be installed with no cutting of the dash. Did your Sony need some sort of mounting adapter to screw it in place and if so what adapter did you use? I want my stereo install to be as painless and uncomplicated as possible. Also, what about the speakers? Do the factory Bose speakers have amplifiers in them? If so, should they be disabled so that the output of the stereo doesn't overload the input of the speaker amps and blow them? Do you recommend gutting the speaker housings (removing the speakers and amps from the housings) and putting better speakers in them? If so, what speakers should I put in them? They would have to be able to fit inside the housings and be able to handle a decent amount of power because I might put an aftermarket amp in it (nothing too serious though, just something that has a bit more power than the factory Bose amps). If anybody else on here has a stereo recommendation that meets the minimum requirements mentioned above (double din size, USB port in front, no dash butchery required to install it) feel free to chime in.
Reply
Old Sep 20, 2019 | 07:43 PM
  #10  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

If you follow the links and do some reading at Crutchfield, it will answer all your questions.
Reply
Old Sep 24, 2019 | 08:57 AM
  #11  
TheGreek!'s Avatar
TheGreek!
Thread Starter
Pro
 
Joined: Apr 2016
Posts: 512
Likes: 62
Default

Originally Posted by drcook
If you follow the links and do some reading at Crutchfield, it will answer all your questions.
I bought this sterero from crutchfield yesterday:

https://www.crutchfield.com/p_105KWR...mnews=15689488

It has what I'm looking for in a sterero (front USB and aux ports, CD player, Bluetooth, and works with Android phones), it's a name brand (JVC), and the price was real good. You also get the wiring harness and stereo mounting kit for free. And free 2 day shipping to top it off. Looking forward to seeing how it sounds but I'm not looking forward to doing the install, lol.

Last edited by TheGreek!; Sep 24, 2019 at 08:58 AM.
Reply
Old Feb 25, 2025 | 12:59 PM
  #12  
paraGoh's Avatar
paraGoh
Intermediate
All Eyes On Me
 
Joined: Apr 2024
Posts: 45
Likes: 1
Default

Just wanted to know if anyone can point me in the right direction in how to route the metra adapter rom the foxhole in the 93 to the head unit location while maintaining the most oem look in the cabin as possible?
Reply
Old Feb 25, 2025 | 01:43 PM
  #13  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

foxhole ???
Reply
Old Feb 25, 2025 | 01:53 PM
  #14  
2011KLR's Avatar
2011KLR
Drifting
Veteran: Air Force
Community Builder
Photogenic
Top Answer: 3
 
Joined: Sep 2022
Posts: 1,488
Likes: 395
From: Liberty, SC
2023 C4 of the Year Finalist - Unmodified
Default

Foxhole - Somebody's been watching John Wayne movies.

Surely they refer to the storage compartment behind the passenger seat.

I dont have a 93 but surely the Metra adapter isnt designed to replace all of the wires between the head unit and the CDM in the foxhole.
Reply
Old Feb 25, 2025 | 02:15 PM
  #15  
IHBD's Avatar
IHBD
Melting Slicks
All Eyes On Me
Shutterbug
Top Answer: 5
Pro Mechanic
 
Joined: Nov 2016
Posts: 2,256
Likes: 3,083
From: So Cal
2023 C4 of the Year Finalist - Unmodified
Default

Originally Posted by 2011KLR

I dont have a 93 but surely the Metra adapter isnt designed to replace all of the wires between the head unit and the CDM in the foxhole.
Actually, the Metra harness IS intended to replace all the wires between the aftermarket head unit and the speaker and power wiring connections at the CDM. The Metra harness is uber-long because it can also be used for Cadillacs and Buicks that had the CDM mounted in the trunk.

It was this thread that informed me about the possibility of a "pop" from the speakers on power-up. Crutchfield includes 'free' installation supplies when you purchase a unit from them. I had bought a unit that I didn't need the install kit for the car I was working on, so I asked for install stuff for the 90 Corvette which included the Metra harness. Years later, I installed an Alpine in my 90 I recalled the "pop warning" in this thread and did a quick mock-up using the Metra harness and sure enough, it popped. I found and bought the SNI-1 and no more pop.

I see no reason you need to retain the CDM if the Bose head unit is also being removed. (As mentioned in this thread.) If your car has Manual HVAC controls, you need the "resistor fix" on one of the connectors in the dash to prevent SYS warnings. If you have C68 electronic HVAC, contrary to popular belief, you don't need the resistor(s).

Most head units that have the necessary pre-amp outputs also have a dedicated antenna wire (usually blue) that only powers on when the source is "Tuner". You use the amp turn-on wire (usually blue/white) to power the Bose amplifier relay. The Metra harness only has one wire in it, so you have to add another if you want the antenna to be independent of amplifier turn-on.

I've done two of these aftermarket head units retaining the Bose amplified speakers. The 90 and my current 92. When I sold the 90, the purchaser wanted the stock Bose set up, so I was able to put it back with no issues. That all went into the 92, although I did shorten the Metra harness for the 92 rather than wad up 20 feet of extra wiring like I did in the 90. Again, you have to use the noise filters with the Bose speakers..

Cheers.

Last edited by IHBD; Feb 25, 2025 at 02:59 PM.
Reply
Old Feb 25, 2025 | 03:18 PM
  #16  
drcook's Avatar
drcook
Safety Car
Photogenic
Photoriffic
Liked
Top Answer: 1
 
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
Default

I pulled the passenger's seat, took the console out and ran the wires under the carpet and through an existing hole in the rear bulkhead.
Reply
Old Feb 25, 2025 | 10:59 PM
  #17  
2011KLR's Avatar
2011KLR
Drifting
Veteran: Air Force
Community Builder
Photogenic
Top Answer: 3
 
Joined: Sep 2022
Posts: 1,488
Likes: 395
From: Liberty, SC
2023 C4 of the Year Finalist - Unmodified
Default

Thanks for the clarification IHBD. Idda never expected that.
Reply

Get notified of new replies

To C4 stereo wiring harness adapter





All times are GMT -4. The time now is 01:17 PM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE