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Metra 70-6504 Amp Bypass Harness

Allows you to install a new car stereo and bypass the factory amplifier in select Jeep, Chrysler, and Dodge vehicles

Item # 120706504

This Metra 70-6504 amp bypass harness allows you to install a new car stereo in your car without having to cut the...

Find what Fits your car

This Metra 70-6504 amp bypass harness allows you to install a new car stereo in your car without having to cut the...

Item # 120706504

In stock

About the Metra 70-6504 Amp Bypass Harness

This Metra 70-6504 amp bypass harness allows you to install a new car stereo in your car without having to cut the factory wiring.

This Metra 70-6504 amp bypass harness allows you to install a new car stereo in your car without having to cut the factory wiring.

Simply splice the color-coded wires on your Crutchfield integration adapter to the wires from your aftermarket stereo — you can crimp or solder the connections in the comfort of your home without having to struggle with splicing wires behind your dash. Next, plug the Crutchfield integration adapter into the harness that you removed from your factory radio.

Since you didn't have to cut off your car's original radio connector, it's easier to put the factory radio back in when you sell your vehicle or return it at the end of the lease. Just plug the factory radio back in and keep the aftermarket stereo. Warranty: 60 days.

Note: This integration adapter bypasses your factory amplifier. In order to install it and make the necessary connections, you will need to run wires from the adapter to a switched power source and to your factory amp location above the kick panel on the driver's side. You'll lose the factory subwoofer when the amp is bypassed.

Please enter your vehicle information or call a Sales Advisor at 1-888-955-6000 to find out if this model is compatible with your vehicle.


What's in the box:

  • 6" Constant Power/Ground harness
  • 17' Speaker harness
  • 17' Tweeter/Center channel harness
  • 42" Switched power wire
  • Fuse tap
MFR #70-6504

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More details on the Metra 70-6504 Amp Bypass Harness

Stacey B.

Product Research


Wiring Harness: This wiring harness prevents 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 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 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 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:

(Constant Power/Ground Harness)

Wire Color Function
Yellow +12 Volt Constant
Black Ground

(Tweeter/Center Channel Harness)

Wire Color Function
Yellow/Blue Left Front Tweeter +
Yellow/Black Left Front Tweeter -
Yellow/Red Right Front Tweeter +
Yellow/Orange Right Front Tweeter -
Brown/White Center Speaker +
Blue/Pink Center Speaker -

(Power/Front Speaker Harness)

Wire Color Function
Green Left Rear Speaker +
Green/Black Left Rear Speaker -
Violet Right Rear Speaker +
Violet/Black Right Rear Speaker -
Gray Right Front Speaker +
Gray/Black Right Front Speaker -
White Left Front Speaker +
White/Black Left Front Speaker -
White/Red Not Used
Green/White Not Used
Brown/Blue Not Used
Brown/Yellow Not Used


  • There is no switched power wire in any of the harnesses. An additional 42" red wire is included, along with a fuse tap to access a switched +12 volt source in the fuse block.
  • The center channel speaker, if present, is not used in most aftermarket systems.

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Customer Q&A

Crutchfield asked: Why did you buy this?
Only one that fits my vehicle [ robert  Apr 20, 2019 ]
Only reasonable way to bypass an Infinity amp and there is plenty of length to get you all the way to the back of a minivan. [ Gil  Jan 19, 2019 ]
My new car stereo required it and was part of the installation kit [ David  Dec 15, 2018 ]
We purchased the vehicle already had an aftermarket radio and someone only wired the two front speakers, so with this harness I will be able to listen to all the speakers and finally get a good sound! [ Daniel and Heat  Oct 18, 2018 ]
My Dodge 2005 Grand Caravan has a factory amp that is very weird and requires a turn-on signal from the factory head unit. Install has to bypass, totally not use, the factory amp. This kit has enough wiring to get the job done. [ Jim D  Aug 17, 2018 ]
Comes w/ the installing kit. [ pierre  Mar 25, 2018 ]
For aftermarket stereo setup. [ Jordan  Feb 27, 2018 ]
Was required for install [ MarkN  Jun 12, 2017 ]
Was suggested for install for stereo [ Jamie  Dec 17, 2016 ]
came as part of the installation kit for my SUV [ Edwin  Nov 27, 2016 ]
It works [ jorge luis  Aug 26, 2016 ]
Bypassing factory car amp for my 2006 Dodge Magnum. [ Ramon  Apr 03, 2016 ]
My factory amp will handle the sound, but I will lose fader functionality. This will allow the use of the built in amp in the stereo and have a fader. [ JOSH  Apr 01, 2016 ]
Need it [ Sara  Mar 14, 2016 ]
I wanted a harness I could use to bypass my factory amp without having to cut any wires and save me time [ gomezj22  Feb 22, 2016 ]
This item is a must have for my van [ David  Feb 12, 2016 ]

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