I think a must have item for install.

really a must have for installation - will save tons of time when you figure out what you need. I didn't need a lot of the harness because I didn't use an amp in my install - but it's there if you need it.

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Metra 70-1857 Bypass Harness

sorry its not compatible with the original connectors

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Nice item

This is a real quality product and good instructions for installing are included

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Metra 70-1857 Bypass Harness

great product it fit well

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Metra 70-1857 Bypass Harness

Great installation harness to wire up you new stereo system and you do not want to cut up the existing wiring harness in your corvette.

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Metra 70-1857 Bypass Harness

Worked with no problems at all! Direct hook up and did exaclty what I wanted!

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Metra 70-1857 Bypass Harness

Made installation a snap.

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Metra 70-1857 Bypass Harness

You need it to wire your stereo to your car factory wire

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Life made easier

My husband is putting a new "modern" steel system in my 1995 Corvette he said this wiring harness made his job much much easier also you sent it right out and I received it in 2 days

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Metra 70-1857 Bypass Harness

WIRING KIT IS GREAT JUST WAY TO LONG.

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Metra 70-1857 Bypass Harness

Made wiring simple

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Works, but be prepared for issues

Harness worked for installing a Sony double DIN receiver in my 95 Corvette but is about 6ft longer than really needed so I ended up with a bunch of extra I had to find a place to coil up and hide. Also had a horrible popping through the Factory Bose speakers/amps every time the radio powered on or the station/input was changed. This was cured by installing a pair of ground loop eliminators between the receiver and the RCAs. Also, I found out after getting everything routed and tucked away from the radio back, the larger plug will not fit through the factory wiring hole so you must start from the cubby behind the passenger seat and work your way forward. These problems may not be an issue with a different radio or application.

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1990 Corvette with Bose stereo originally.

Product worked as it should. I installed it in my 1990 Corvette convertible. But I only needed to go from the radio 2 foot under the dash to where the factory tuner was originally. All in all it worked!

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Too much wire

This harness is way too long for Pre 93 Corvettes. There is no place to stash all the excess inthe space below the glove box.. I understand that it is designed for many other Bose equipped cars,

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Loud popping with factory Bose amplified speakers

Used this harness and it was easy enough to hook up. Everything seems to work/sound ok except for the loud popping I get whenever changing inputs or radio stations.

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Metra 70-1857 Bypass Harness

The harness is designed to be used with Bose systems in Cadillacs and Corvettes. Corvettes are half the size, so you end up with 10 feet of extra wire and where to hide it. Ideally there would be one exclusively for corvette use.

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Metra 70-1857 Bypass Harness

Perfect fit and easy to use, made eliminating the original Bose head unit and CDM easy. The only hard part was getting to and removing the CDM after that it was a snap.

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Metra 70-1857 Bypass Harness

Harness did not fit my installation. I did end up using the wires for the installation but ended up splicing and soldering. This will not fit GM (Corvette) Bose installations unless you are keeping the speakers/amps and run this to the control unit.

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Made installation/wiring easy (but really long wires)

Other than being by far too long for my application, I am very pleased with the bypass harness. I will probably cut the harness down to a manageable length since I am not using the RCA inputs.

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Metra bypass harness for my 1995 Corvette

Worked Great!

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Metra 70-1857 Bypass Harness

Worked great!

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Metra 70-1857 Bypass Harness

Works great in my 93 vette. Saves a whole bunch of time. Plugs right into rear amp unit and only a couple wires to do (solder,) at receiver. Thx

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Plug and play

Plug and play in 92 corvette with factory Bose gold system. If not for this harness I wouldn't have been able to update my head unit to the most modern tech there is to offer these days

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Wires could be shorter

Made the installation easy, although the wiring was nearly 2X too long. It is the same for a Cadillac as well as my Corvette, which doesn't need wires so long.

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Works great

Ok, so I have a 93 vette with the bose gold, everything worked fine but I wanted to upgrade to something with gps, this was perfect, yes I get a pop here and there from changing stations etc, no big deal to me, the harness is really long, so what, for the price when my bose amps and speakers ar perfect its awesome

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Metra 70-1857 Bypass Harness

Length of harness required customization for installation in 1990 Corvette ZR-1. Would work well in 1993 - 1996 since the CDM was moved from under the dash to behind the driver seat. After modifying the harness (shortened), all that was left to tuck away was the antenna coax. Worked well to drive BOSE amplified speakers in the Corvette.

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Metra 70-1857 Bypass Harness

After I hooked it up using the RCA jacks that it came with it popped every time the radio turned on or off. So I had to get a different adapter without the RCA jacks and hook up straight to the speaker wires on the new unit. Now there is no popping. So I was unable to use this adapter. Waste of money for me

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Metra 70-1857 Bypass Harness

This kit worked great except it universal to the Corvettes that have the CDM behind the drivers seat and the ones where it's located under the dash. Mine was under the dash. Had to cut a lot of wire off, but you can cut the antenna line. It was a challenge to get all that extra line spooled up and tucked up in a very tight space.

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Metra 70-1857 Bypass Harness

The Metra bypass harness worked great. Replacing the Bose head unit in a C4 Corvette is an extra challenge. But the Metra bypass harness made the job a lot easier. Just plug it into the connectors for the Tuner Controller and run the wires to your head unit. The harness has plenty of length for the pulling. In fact, you may end up trimming it back a bit. I would definately buy again.

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Must have!

Too long..... As others have stated, it's way too long. However, I'm assuming this is because it fits many other models, but it worked perfectly for me, (1992 Corvette). I wanted to keep using my original speaker with built in amps, so this was the best way to achieve that. Good directions, and good quality. Be advised however, that you will need to "splice" into your factory wire harness to allow for your new head unit to be dimmable at night. It's only one wire though, and the directions tell you this, but you'll have to find your cars "dimmer/illumination" wire yourself. On the 92, it's the grey/black wire, you can check by turning your headlights on and using an ohm meter to check for voltage change when using dimmer switch. Great product ??........ pain in the rear job!

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Metra 70-1857 Bypass Harness

I installed this in my 1996 Corvette with factory Bose system. I wanted to keep my Bose amps. and speakers but change out my head unit. This connected to the connectors which are going to the factory tuner/preamp located behind the passenger seat storage compartment. I removed the Tuner/preamp and connected the Metra 70-1857 to the factory wiring harness. I soldered the other end to the Pioneer AVH-2440NEX harness. It worked well. The harness is extremely long, I had to wrap it up in a bundle with wire ties. But my Bose ams/speakers sound good with no pops or noise.

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Simple

Very simple hook up, but they give you way more cable than needed, I had to try and hide close to 8 foot of cable in a Corvette, not a very easy task.

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Easy to install, allowed me to keep my bose system

Easy install, just read the instructions. Cables are extremely long so plan on a place to hide them. I put them where my old receiver was in 94 corvette

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Metra 70-1857 Bypass Harness

It taken five min to hook ever thing up after I got all the wires were they need to go. I would use cruchfield all the time great products fast services. And their for you on the phone all the time. 5stars Thanks For great help.

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Metra 70-1857 Bypass Harness

just wish it was about 4ft shorter

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Metra Harness for Bose Install

Product made it super easy to keep my existing Bose setup. Had to swap it out for a defective one, but once the new one came it went in in less than 30 min. Sound is great but had to purchase an in line ground loop isolator for the RCA inputs as it did add noise, but advise if you get this, dont skimp and get the isolators.

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Metra 70-1857 Bypass Harness

Just perfect for my 93 Cadillac Seville STS , but got a problem with popping in my speakers when turning ingnition on and off

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Metra 70-1857 Bypass Harness

Very nice install used on 91 Corvette ZR1 to replace Bose system.

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Metra 70-1857 Bypass Harness

Works as expected, I failed to read the directions carefully, but a quick call to customer support put me on the right track, the information is there just read it. I would have given 5 stars, except for an annoying pop when the unit is turned off and on, seems to be related to the power antenna, unhooked all the grounds in the kit, the radio still worked, but still popped, unhooked the frame ground on the antenna, still worked, still popped, puzzling. otherwise happy, radio sounds great all functions work great, easy hookup.

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Metra 70-1857 Bypass Harness

Worked well for my 1990 Corvette. My only complaint is with the Crutchfield instructions themselves, they said that my amp (well the controller for the amp at least) was in the rear of the car when actually it was behind the glove box. Crutchfield support figured this out fairly quickly after I got on the phone with them. Also, this harness did not provide support for my power antenna or dimmer. This is probably also due to limitations with the car's existing wiring I imagine though.

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Metra 70-1857 Bypass Harness

Needed for install of radio on a 1991 Corvette with the factory Bose system (unless you're an idiot and actually cut the factory wiring). All connections worked fine. Only issue is the harness is very, very long, just requires you to find a place to store all the excess wiring. I placed my excess where the actual tuner was mounted.

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Metra 70-1857 Bypass Harness

Works great, used it on my 96 corvette with the Bose.

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Metra 70-1857 Bypass Harness

In the end I decided to bypass the bose altogether. The kit provided the much needed antenna lead and plenty of wore to boot. A wide buy.

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A must have!

I actually installed this into my 1996 Corvette convertible not the coupe. If your older C4 Corvette has the Bose system and you want to keep the Bose speakers this is a must have! The only knock is the lack of detailed instructions that come with this harness so I will try to help. The radio in the late model C4 Corvettes is actually more or less a "dummy" unit. The actual tuner for the vehicle is tucked behind the passenger seat under the rear storage container. This harness is designed to run from your new aftermarket head unit back to the wiring harnesses hooked up to the factory tuner. The vehicles stereo antenna lead is also located behind the passenger seat near the stereo tuner. Basically you unplug all of the harnesses going into the stock stereo tuner and install them into this aftermarket harness along with the factory stereo antenna lead which is tucked away closer to the rear of the passenger seat inside the storage compartment (I had to reach in and feel for it to find it). The actual hook up of this harness to your new aftermarket stereo is a breeze. While some folks on here are unhappy with the length of the wires I found that if you do a thorough and proper installation you will use the majority of the wires length. I must say that I was somewhat skeptical about how well this wiring harness would work and difficulty of installing it but after my installation experience it was surprisingly easy and provided me with the results that I was looking for.

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Bose bypass harness works great!

harness worked great and just as described. Allowed me to connect a new receiver to my existing Bose Gold amplified speakers. Could use a bit more documentation on how to connect and would benefit to note that PAC-SN1 ground loop isolators should be used to eliminate power on and source change pop from factory amps.

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Bose harness

Great plug and play product, just a little long for corvette.

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Great Working product,

Ordered this to make my aftermarket stereo work with my existing Bose system, and it works fantastic. the sound is still great, and now an old car has a new class of stereo.

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Easy to install

Was very easy to install and had plenty of length to reach where I needed it to.

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Does the job

Great interface, but 6' of extra cable

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Must have for replacing Bose

This was a huge help with replacing the Factory Bose unit in my 94 corvette. It has all of the connections you need. There are no instructions but basically you need to check out the instructions at ZIP corvette. You will need to run the wires along the passenger side of the car. (Zip recommends removing the seat but I didn't need to do that. It's a big job but well worth it.

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awesome

Awesome, works as described! fast shipping!

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VERY HELPFUL

THE HARNESS WAS VERY HELPFUL

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1993 Caddy Radio project

Ordered the wrong wiring harness even after talking to a consultant that advised me of a possible error I had made but I didn't listen to him. Great products/Great people/Great Company!! Have the right part now after swapping out. I have dealt with Crutchfield before on other products & vehicles and cannot put into words how impressed I am with all aspects of this Company. You will always have my business and I am recommending your Company to all my friends and family . Your Professionalism, Product support, Outstanding Staff are what is all about. Wish the rest of America would figure that out! Great job!!

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Metra 70-1857 Bypass Harness

A well made harness but it was only a little helpful and I only used some of it . I believe this was because of my vehicle type which is a 1992 corvette with a Bose system but on another Chevrolet product I think it would be fine

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Defintely easier install

Good Idea

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Not quite the way I thought it would work

While supposedly this was meant for my '95 corvette, and the instructions were fine, it somehow didn't quite fit the way I envisioned it. The product itself was great, and very long which turned out to be useful.

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Metra 70-1857 Bypass Harness

I just want to say thank you so much to the crutchfield team of techs that helped me install my stereo I had to call a couple of times for help . My stereo sounds excellent once again thank you . I have since recommend crutchfield to my friends .

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Metra 70-1857 Bypass Harness

This adapter is the perfect answer to the problem of connecting to a bose amplified speaker system. It would be a bargain at twice the price.

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Did everything as advertised

The cable itself was awesome. The directions only included a wiring diagram; no instructions. In the case of a Corvette Bose system, this cable is intended to connect to the hidden pre-amp behind the seat. In my case I believed it connected into the wire harness behind the head unit, but the connectors would not match up. Nothing in the included paperwork indicated this. I will say, though that one call to the Crutchfield Help desk solved the issue in under 2 min. The tech knew immediately the specifics of the '96 Corvette and pointed out where the cable connected. It was very refreshing to have someone pick up the phone immediately and speak clearly, in proper English as well! High five to Crutchfiled!

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Metra 70-1857 Bypass Harness

Harness is 17 feet long which may be required for some applications. 6 feet length would have worked for my application. The power leads can be cut down but the amplifier leads would be more difficult and you would require a shorter antenna lead.

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excellent

Ordered this for my HD pioneer, for my 91 Corvette base model with Bose system. This is allowing the faders to work. It simplified everything!!! Not confusing at all either. Troy was very helpful in finding what i needed. Thanks!!!!

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Great adapter!

Perfect adapter and quality connections. Be prepared to have a lot of wire. It weighs a few pounds, and is enough wire to span the length of a SUV!

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Must havve

Without this, the installation would have been a nightmare

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Works!!!!! Not and really easy

Very good Quilty wires and plug.........

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Metra 70-1857 Bypass Harness

didnt come with line filters

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Every thing I needed

After a couple discussions with the tech at Crutchfield, the harness was pretty easy to figure out, worked great.

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Works great

Installed on 1992 corvette with Bose system worked excellent. Attached aftermarket head unit to bose speakers. Only down fall to much wire for my application should be more tailored to vehicle.

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Wire harness

Had no instructions

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Crutchfield response on 5/30/2012

Thanks for your comment. This adapter works in many different vehicles, and we do offer complete instructions for most of them. If you need information that doesn't come with your product, our tech support specialists can provide it over the phone.

helpful!

A helpful piece for and easier install. I used it in my 92 cadillac eldorado with bose!

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cool

helpful easy to install but there is some unwanted noise the most difficult stereo ive done yet 1994 cadillac eldorado with bose stereo

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