Metra 70-1677-1 Receiver Wiring Harness

Connect a new car stereo in select 1970-93 General Motors-built vehicles

Item #: 120701677

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51 Reviews | 1 question - 1 answer

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Metra 70-1677-1 wiring harness

This vehicle-specific wiring harness makes connections between your new car stereo and your car's electrical system.

First, attach the color-coded wires on your Crutchfield-supplied harness to the wires from your new stereo. If you're not using a soldering iron, we recommend that you purchase some wire connectors to secure the connections. Check out our handy article on three ways to connect the wiring harness here.

Now, once this harness is connected to your new stereo, you'll be able to plug right into your car's factory radio connector. This harness saves installation time since you won't have to cut factory wires individually, and it also enables you to re-install the factory radio if needed. A detailed instruction sheet comes with the harness. Warranty: 60 days.

Please read this important note: This harness may not contain provisions for every wire needed to complete your installation, and it will not accommodate special navigation, video, or factory steering wheel control connections. You will need a special adapter if you want your factory steering wheel audio controls to work with your new stereo.

Connections:

Note: The 12V constant power lead may not be present in your car. If not, and your receiver requires a constant 12V memory lead (most do), run a wire directly to the battery or an appropriate un-switched fuse.

  • 12V constant power
  • 12V switched power
  • chassis ground
  • power antenna turn-on
  • dimmer
  • left front speaker +/-
  • right front speaker +/-
  • left rear speaker +/-
  • right rear speaker +/-

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

  • 8" Switched Power/Speaker wiring harness
  • 7.5" Constant/Illumination harness
  • Instructions

Product Research

Crutchfield Wiring Harness: Crutchfield wiring harnesses prevent you from having to cut your vehicle's factory radio plug when replacing your factory radio with an aftermarket head unit. Simply solder or crimp the Crutchfield wiring harness to your aftermarket head unit's harness (solder & crimps not included), plug the aftermarket head unit's plug into the rear chassis of the aftermarket head unit, and plug the Crutchfield wiring harness into your vehicle's factory radio plug.

Note: Installation tools, hardware, & accessories are not included & sold separately. Please see the Accessories tab for recommendations & availability.

Wiring Notes: If the Crutchfield wiring harness is not equipped with a ground wire, you will need to ground the aftermarket head unit's ground wire to the metal chassis of your vehicle. Some vehicle's may require you to bypass the vehicle's factory amplifier (in another location from factory radio) or hardwire certain connections. If your vehicle is equipped with factory steering wheel controls, an additional SWIC adapter is required & sold separately.

Wire Code Chart:

(Switched Power/Speaker Harness)

Wire Color Function
Red +12 Volt Accessory
Black Ground
Blue Power Antenna
Empty (none)
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 -

(Constant Power/Illumination Harness)

Wire Color Function
Yellow +12 Volt Constant
Orange Illumination

The Crutchfield Car Selector: Please visit the Crutchfield Car Selector for your specific type of vehicle.

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 open the box, verify contents, 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.

Metra 70-1677-1 Receiver Wiring Harness Reviews

Average Customer Review:

51 reviews
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buyer

Written By Anonymous, Gallatin,MO on Wednesday, October 29, 2014

Crutchfield Customer Review (What's this?)

good

Metra 70-1677-1 Receiver Wiring Harness

Written By Sooner Russ, Norman, Oklahoma on Sunday, October 26, 2014

Crutchfield Customer Review (What's this?)

Quick shipping and everything worked easily. Will definitely use Crutchfield again.

Pros: Easy to use

Cons: None

Metra wiring harness the best

Written By Jpaez, Alice Texas on Tuesday, October 21, 2014

Crutchfield Customer Review (What's this?)

The product makes life easy and the radio install quick, has color coded wires that tell you every thing ,pertty much plug n play

Pros: Every thing is good about it,perfect!!!

Cons: I really did not find any cons about it

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, Palmer ak on Saturday, October 18, 2014

Crutchfield Customer Review (What's this?)

Shipped fast. Exactly what I needed.

Incorrect harness

Written By Bubbie!, Walkersville, Md. on Thursday, July 31, 2014

Crutchfield Customer Review (What's this?)

The harness came with the receiver, I ordered. However the harness did tie into the existing wiring. .

Pros: Uncertain

Cons: Uncertain

Receiving Wiring Harness

Written By Charity, Augusta, GA on Thursday, July 24, 2014

Crutchfield Customer Review (What's this?)

Good Product

Pros: Installed first radio in less than an hour, mostly due to the simplicity of the wire harness.

Cons: This is not a one piece plug like the original stock piece. Instead, these are 3 separate plugs. Lack of directions for the novice knowing to attach same color wires from harness to wires harness that attached to radio... since additional wires on both sides. That would've made it a little quicker.

Metra 70-1677-1 Receiver Wiring Harness

Written By Nelson C., Utuado PR on Thursday, May 15, 2014

Crutchfield Customer Review (What's this?)

Just Great easy to install fits perfect.

Pros: Easy connect to the factory harness , you cant go wrong.

Cons: none

Not quite plug and play but close

Written By Pappy, Point Pleasant, WV on Sunday, March 09, 2014

Crutchfield Customer Review (What's this?)

This is a good product and makes wiring a snap. The only issue on my older Chevrolet Blazer is there is 2 different pigtails and the directions for the connection of the illumination wire is a little vague. One call to tech support and all is well.

Pros: Ease of use and quality product. Its free with the head unit!

Cons: Everything is good.

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, Tyler, TX on Wednesday, February 12, 2014

Crutchfield Customer Review (What's this?)

Saves time!

Wire Harness

Written By Tim T, MANSON IA on Monday, February 10, 2014

Crutchfield Customer Review (What's this?)

Wire harness

Pros: Fit perfect

Good Product.

Written By Wheaties, Dundee, MI on Wednesday, January 15, 2014

Crutchfield Customer Review (What's this?)

Included with my Pioneer head unit but I would have gladly paid for it. Really helps with specific vehicles to make all the right connections. Can't do without it unless shade tree is how you operate.

Pros: It's all good.

Cons: None.

Makes it easy

Written By Duke, Fredericksburg, PA on Wednesday, September 11, 2013

Crutchfield Customer Review (What's this?)

This harness made hookup very simple. Along with the detailed instructions and diagrams, the unit was up and running in no time.

Pros: Easy to understand and install.

Cons: None

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, Sparks, NV on Tuesday, August 20, 2013

Crutchfield Customer Review (What's this?)

Easy to install

Works perfect

Written By Anonymous, Arkansas on Monday, August 19, 2013

Crutchfield Customer Review (What's this?)

Fit perfect to the factory harness

Good product

Written By NickR, Asheville, NC on Saturday, August 10, 2013

Crutchfield Customer Review (What's this?)

quality product and fit my application perfectly. However, instead of being a one peice plug like my 1988 Chev. S-10, it was three separate plugs.

Pros: proper fit and match for my application

Cons: This is not a one piece plug like the original stock piece. Instead, these are 3 separate plugs.

just right

Written By joe, avondale,az on Thursday, July 25, 2013

Crutchfield Customer Review (What's this?)

it fits perfect crutchfield has great products and so easy to order

Excellent Product!

Written By Sal, PA on Sunday, July 14, 2013

Crutchfield Customer Review (What's this?)

Thick gage wires, especially for power. Had zero issues soldering to my radio harness or connecting the old connections to it. Wiring diagram was accurate and clear aside from the "Power Antenna" wire which I didn't not use but my stereo works fine.

Great harness

Written By Jason, Junction city ks on Saturday, July 06, 2013

Crutchfield Customer Review (What's this?)

The harness is great. I used it with my 1990 gmc s15 and it connected perfect. The s15 has a few different plugs so I was worried that I would get them mixed up. But there are grooves on this harness that won't let you plug in the wrong one on the wrong whole. It also comes with long enough wires to do any thing you would need. The color diagram was spot on and perfect when hooking it it up with the head unit.

Pros: Everything about it

Cons: Nothing at all

Top Notch

Written By Rick, Albany, Ga on Monday, May 20, 2013

Crutchfield Customer Review (What's this?)

Very high quality. Nicely labeled and fit like a glove.

Pros: Heavy gauge wire, quality materials.

Cons: none

Metra 70-1677-1 Receiver Wiring Harness

Written By Mphs, Memphis TN on Tuesday, April 23, 2013

Crutchfield Customer Review (What's this?)

Str8 no cutting

Receiver Wire Harness

Written By Marco, Long Island, NY on Thursday, April 18, 2013

Crutchfield Customer Review (What's this?)

Great conector

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, Louisville, KY on Monday, April 15, 2013

Crutchfield Customer Review (What's this?)

Great product

The only way to go!!

Written By GeorgeD, Tipton, MI on Thursday, March 28, 2013

Crutchfield Customer Review (What's this?)

This is the only way to go when replacing a factory radio with an aftermarket unit. NO HACKING OF THE CAR'S HARNESS REQUIRED.

Poor instructions

Written By DonP, St. Charles, Mo. on Friday, March 08, 2013

Crutchfield Customer Review (What's this?)

The product itself is okay but the instructions for the harness are pretty much non existing. The speaker wires from this harness to the PAC converter is pretty much a color code match but the Antenna/Amp power wire connection was guess work. I had an additional wire that was not mentioned anywhere in any of the instructions. After 4 calls to the Tech support, I suggested this wire may be why I didn't have sound and he agreed. It was the reason. and now I have sound. Need a bit more detail on how to connect the blue/white antenna/amp tripper wire. It's labled Remote Control wire which leads you to believe its some kind of antenna for the remote control for the radio.

Pros: Seems well made.

Cons: Incomplete instructions for my application but your Tech Support is great.

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, mcdonough, ga on Thursday, February 21, 2013

Crutchfield Customer Review (What's this?)

right on!!

Metra 70-1677-1 Receiver Wiring Harness

Written By Kaz, Delano, CA on Tuesday, January 08, 2013

Crutchfield Customer Review (What's this?)

did not fit

Cons: Wrong part. Had pro install plug, did not fit. Had to buy correct part to fit. It was free, but didn't fit, so what good was it?

Harness

Written By DennisA, Napa, CA on Saturday, December 22, 2012

Crutchfield Customer Review (What's this?)

Plugged right into the factory harness.

Pros: Simple install

Cons: Didn't come with butt connectors

Harness

Written By Anonymous, California on Thursday, November 22, 2012

Crutchfield Customer Review (What's this?)

Not worth the trouble

Pros: Only worked for two wires

Cons: Way to bulky

Receiver Wire Harness

Written By Riley R., Antigo, WI on Tuesday, November 13, 2012

Crutchfield Customer Review (What's this?)

Very nice, saved alot of time

Metra 70-1677-1 Receiver Wiring Harness

Written By Jerry, St. Charles, Il on Monday, November 12, 2012

Crutchfield Customer Review (What's this?)

Went together easily, no surprises.

Reciever Wiring Harness

Written By Steve M, Las Vegas on Wednesday, August 29, 2012

Crutchfield Customer Review (What's this?)

This wiring harnesss made installation a breeze. There was only one wire that I had to wire sepeartely. I pre-wired the JVC head unit before starting the install. Once I got the radio chassis mounted in the dash, The radio was plug and play after that. Great product

Harness

Written By TJ, Austin, Texas on Thursday, August 09, 2012

Crutchfield Customer Review (What's this?)

I love this product, too bad the factory connector had been removed prior to this install.

Pros: Great product for fast assembly.

Cons: If not factory radio more then likely the factory connector has been discarded.

Good Product

Written By gwgdog66, Oklahoma City OK on Sunday, June 17, 2012

Crutchfield Customer Review (What's this?)

Works great and allows the use of existing factory wiring

Pros: Fits many aftermarket radio's

lifesaving assistance

Written By MikeG, Elwood, IN on Friday, June 15, 2012

Crutchfield Customer Review (What's this?)

The combination of instructions, drawings, parts, wires, and hardware is FABULOUS! It is so calming to know that you have everything that you need, so that you can just concentrate on figuring out how to use it.

Pros: Everything is the right size, it all fits together, the step-by-step directions are written by people who know what they're talking about, and it's truly a CUSTOM kit-not some generic "in-the-ballpark" junk.

Cons: none.

Reciever wire harness

Written By mrdeeno2, Nebraska on Wednesday, May 23, 2012

Crutchfield Customer Review (What's this?)

Everything worked and fitted great, this was a farley easy installation

Pros: good fit ,easy install

Cons: nothing I could see

Makes it easy

Written By Nick J., Pasco, WA on Sunday, April 22, 2012

Crutchfield Customer Review (What's this?)

Well made. Makes installation a breeze. The only problem is that the plug size and tha amount of extra wire makes it a little difficult to fit behind stereo int he dash of 89 olds cutlass ciera. Other than that, saved a huge headache.

Pros: easy to use

Awesome product

Written By Derek, New Jersey on Thursday, February 16, 2012

Crutchfield Customer Review (What's this?)

Worked perectly !

GM Wire Harness

Written By SteveT, Madison Heights, VA on Tuesday, October 11, 2011

Crutchfield Customer Review (What's this?)

Honestly, I have not used this connector yet. The quality of the harness looks very good. I will use this harness when I install my new radio in my Chevy El Camino!

Metra 70-1677-1 Receiver Wiring Harness

Written By mike, phoenix, az on Thursday, August 04, 2011

Crutchfield Customer Review (What's this?)

EASY set up for connections

Metra 70-1677-1 Receiver Wiring Harness

Written By RonG, Butte, MT on Monday, July 11, 2011

Crutchfield Customer Review (What's this?)

Great harness! I would NOT install any equipment without it!

Easy, Quick Installation

Written By Steve D, Fort Collins, CO on Friday, June 24, 2011

Crutchfield Customer Review (What's this?)

This wiring harness made installing the Pioneer Stereo into our S-10 Blazer fast, easy and error free. We had the new unit installed in less than an hour.

Metra 70-1677-1 Receiver Wiring Harness

Written By Willy, Madison, WI. on Monday, May 23, 2011

Crutchfield Customer Review (What's this?)

Wow, does this make for a nice installation. I took extra pains and soldered and shrink tubed every connection. When done just plug it in and it works wonderfully. Instructions are very clear and the color coding is great. I've now used these kits on a GM and a Dodge, Crutchfield really scores a home run on these kits!

Metra 70-1677-1 Receiver Wiring Harness

Written By Anonymous, FL. on Wednesday, October 27, 2010

Crutchfield Customer Review (What's this?)

Wire harness, installation instructions and tech. support were great.

Metra 70-1677-1 Receiver Wiring Harness

Written By Tim, putnam, ny on Sunday, July 18, 2010

Crutchfield Customer Review (What's this?)

Follow the instructions and your golden

Easy as 1, 2, 3

Written By Stevie, Lomita, CA. on Wednesday, April 07, 2010

Crutchfield Customer Review (What's this?)

It was so easy since all the wires have colors that you just have to match together & after a couple of plugs that snap in I was all done.

Easy as 1, 2, 3

Metra 70-1677-1 Receiver Wiring Harness

Written By Jon, alabama on Sunday, January 24, 2010

Crutchfield Customer Review (What's this?)

works great fit just like a factory harness

Metra 70-1677-1 Receiver Wiring Harness

Written By Kevin, Massachusetts on Friday, February 06, 2009

Crutchfield Customer Review (What's this?)

Good product, hooks right up. Make sure you buy crimps or can solder well and have shrink tube! it DOES NOT come with it!

Metra 70-1677-1 Receiver Wiring Harness

Written By rockburnrun, Elkridge, MD on Monday, February 02, 2009

Crutchfield Customer Review (What's this?)

Well made, soldered nicely, and fit perfectly.

Great

Written By turbo442, Vacaville, CA on Wednesday, January 28, 2009

Crutchfield Customer Review (What's this?)

Works perfect and very easy to use. Plugged right in with easy to follow directions

Quick

Written By Robert, Haughton, Louisiana on Wednesday, December 03, 2008

Crutchfield Customer Review (What's this?)

This product was great snapped right into the factory wireing.

Easy install

Written By Aaron, Missouri on Friday, September 12, 2008

Crutchfield Customer Review (What's this?)

This harness was a snap to attach to the radio wires. I soldered the ends together and then it was a simple attachment to the factory wires. Piece of cake install.

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Questions & Answers Ask the community. Share your knowledge.

1 question already asked

We do not carry the factory radio side of the connector. If you want the factory side of the plug you are probably going to need to check a junkyard (I doubt a dealer would have this). Our Tech team will also be able to help you connect the bare wire directly to the wires on a receiver. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help you figure out the best next step. [ Jeff  Feb 13, 2014 ]  Staff

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