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Metra 70-1728 Amp Bypass Harness Connect a new car stereo and bypass the factory amplifier in select 2006-11 Honda vehicles

Metra

Item # 120701728

This Metra 70-1728 harness allows you to bypass the factory amplifier in select 2006-11 Hondas with the...

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Metra 70-1728 Amp Bypass Harness Wiring adapter
Metra 70-1728 Amp Bypass Harness Only at Crutchfield

This Metra 70-1728 harness allows you to bypass the factory amplifier in select 2006-11 Hondas with the...

Item # 120701728

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  • Free lifetime tech support
  • 60-day price-drop protection
  • 60-day returns
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$49.99
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About the Metra 70-1728 Amp Bypass Harness

What's in the box:

Other info:
  • MFR # 70-1728C
  • Item # 120701728
  • California customers: Please click here for your Proposition 65 WARNING.

Featured review

Easy to install, the extra long wires are a must depending on where your factory car audio amp is located. Warning! do not cut these wires until you have established the location of your amp, measure the distance, then add an extra 8-12" inch then cut.

Philly from Tempe, AZ

5 out of 5 stars

See all 53 reviews

More details on the Metra 70-1728 Amp Bypass Harness

Stacey B.
Researched by Crutchfield's Stacey B.
The Metra 70-1728 Amp Bypass Harness replaces these items:

Product Research

Features

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 adapter is required & sold separately.

Wire Code Chart:

(Power Harness)

Wire Color Function
Red +12 Volt Accessory
Yellow +12 Volt Constant
Black Ground
Orange/White Dimmer

(Speaker Harness)

Wire Color Function
Yellow/Blue Left Front Tweeter +
Yellow/Black Left Front Tweeter -
Yellow/Red Right Front Tweeter +
Yellow/Orange Right Front Tweeter -
Green/White Subwoofer +
White/Red Subwoofer -
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 -

Harness Location: The factory plug that mates with the Power Harness is located in the factory radio cavity of the vehicle. The factory plug that mates with the Speaker Harness (used to bypass factory amp) is located at the external factory amp location (below the radio, behind the console). The 17' Speaker Harness will need to be plugged into the external factory amp and then run up to your in-dash aftermarket head unit for speaker wire connection.

Note: An additional aftermarket amplifier is recommended if your vehicle is equipped with Front Tweeters, Front Speakers, Rear Speakers, & Factory Subwoofer.

The Metra 70-1728 Amp Bypass Harness replaces these items:


Adding...
Honda Integration Adapter

Honda Integration Adapter

Bypasses the factory amplifier in select 2006-up Hondas
4.5 out of 5 stars
2 reviews
  • Bypass the factory amplifier in select late model Honda vehicles

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Customer Q&A

6 questions already asked

Q
If i'm planning to install an aftermarket subwoofer do i ignore the subwoofer +/- wires on the bypass harness?
devin  Jan 18, 2025
1 answer
A
Greetings Devin. Thank you for your question. If you purchased the adapter from Crutchfield, feel free to contact our Tech Support team. They can walk you through the wiring. 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.
thomas  Jan 18, 2025 (Staff)
Q
What is the difference between this 70-1728 and the 70-1727 harness? Both are supposed to be an amp bypass harness for 06 Civic EX (and others).
ivan  Aug 29, 2022
1 answer
A
Greetings Hondatech739, and thank you for your question. The 70-1727 has been discontinued over 10 years now. Can it work on the 2006 Civic EX? Possibly, Its since removed from our vehicle guide. The 70-1728 could be the replacement for the 70-1727, by the end of the day because we just have the 70-1728, thats the one to go with for your amp bypass.
thomas  Aug 29, 2022 (Staff)
Q
If I am using an aftermarket amplifier to power all speakers and do not want to use stock speaker wires can I completely ignore the bypass harness and just connect the power harness?
thomas  Feb 01, 2018
1 answer
A
Not sure if I understand you but if u don't want to use the factory speaker wires are you going to run new wires from your door speakers that seems like a lot of work ? But if u do that then yes u don't have to use the supplied speaker wires with the kit
matthew  Feb 02, 2018
Q
Does this harness fit a 2008 Honda Civic Si with navigation?
malachi  Apr 11, 2017
1 answer
A
It looks like this Metra 70-1728 Amp Bypass Harness would be compatible with the '08 Civic SI (w/ navigation). You can also verify that online by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on installation and/or fitment please contact an Advisor by phone (1-800-324-9695) or online chat. Hope that helps!
david  Apr 17, 2017 (Staff)
Q
With the bypass harness, do i just splice into the factory amp harness and leave it plugged into the factory amp or splice into the factory amp harness and leave it unplugged from the factory amp? Never done this before, very confused?
ed  Mar 21, 2016
1 answer
A
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections on the product. 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. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.
kenneth  Mar 21, 2016 (Staff)
Q
where is the external amp on a 2008 honda civic coupe dx? the instructions said it was in the shifter console but the info I'm getting from the Crutchfield website says it's in the back of the car.
zane  Jul 26, 2014
3 answers
A
In my 06 EX it is in the center console, but I believe there are some models that it is under the driver's seat I believe.
eric ronald  Sep 12, 2014
A
I remember getting that big bundle of wire that is pictured here, and I still have most of it. I dont recall having to go all the way to the trunk, and we did pop the console. I was wondering my self why there was so much wire with this adapter. Having to only go to the console gave us all that excess. By the way, my son's Civic is an '06 EX. Hope this was some help.
richard  Jul 26, 2014
A
I know in a 2008 Civic Si, the amp is in front of the shifter console below the dash. I don't know about a DX but I would think it's in the same place.
theodore  Jul 26, 2014
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