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Customer Reviews

Metra 70-8121 Amp Bypass Harness

Allows you to install a new car stereo and bypass the factory amplifier in 2005-06 Toyota Tundra Extended Cab trucks with tweeters

MFR # 70-8121

Metra 70-8121 Amp Bypass Harness

Metra 70-8121 Amp Bypass Harness

Allows you to install a new car stereo and bypass the factory amplifier in 2005-06 Toyota Tundra Extended Cab trucks with tweeters

MFR # 70-8121

13 reviews
View this product

Awesome

Crutchfield customer from Parkesburg, PA on 8/26/2020

2005 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

The perfect part for first gen Tundra with six speakers with amp under back seat, non JBL system. Crutchfield is the best in customer service very helpful and easy to follow instructions.

Pros: Customer support Diagrams - instructions

Cons: $8. Shipping

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Crutchfield customer from Bartlett, TN on 8/2/2020

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Made install easy as ever

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Crutchfield customer from Whitinsville, MA on 5/23/2020

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Very simple to install. Plug and go.

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Amplifier bypass harness

Crutchfield customer from Davie, FL on 11/6/2019

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Perfect solution for my issue. 2005 Tundra with under seat amplifier gave me fits trying to find a solution to bypass. Crutchfield has the perfect solution with this harness. Perfect fit..plug and play literally.

Pros: Came exactly as promised in record time

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Crutchfield customer from Marana, AZ on 7/1/2019

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Harness worked well and was easy to installkiki

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Easy non JBL amp bipass

Crutchfield customer from Hatfield, MA on 6/23/2019

2005 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Everything needed to bypass factory Panasonic amp. You unplug speaker Connector from amp and Plug fits right into that connector..instructions were clear and included. Quality wire and connector. My new system sounds great!

Pros: Easy plug in

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Crutchfield customer from Grass Valley, CA on 5/15/2019

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Very easy to install, it did what I needed it to do, solder a few wires, it by passed the amp, plug and play!

Pros: Great harness to bypass the amp.

Cons: None

Crutchfield response on

0 of 0 found this helpful

Worked great!

Crutchfield customer from Tallahassee, FL on 4/29/2019

Verified customer (What's this?)
Verified employee purchase (What's this?)

Worked great!

Pros: Perfect!

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Crutchfield customer from Sunland, CA on 3/3/2019

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

06 tundra with amp under back seat fit perfectly easy to install great product

Pros:

Cons:

Crutchfield response on

0 of 1 found this helpful

2005 tundra non jbl amp under rear seat great harnesss

Robert from Grass valley, Ca on 1/11/2019

2005 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Best harness ever! Struggling with this upgrade for days. 2005/06 Toyota Tundra extended cab 4 door (two small suicide doors)(Non-JBL) with door tweeters and the amp under the rear passenger seat (under black plastic cover in some cases) Two local car stereo places said it wasn't possible. It was, with this great product. Thanks. Highly recommend.

Pros: works

Cons: None

Crutchfield response on

2 of 2 found this helpful

Metra 70-8121 Amp Bypass Harness

Jim from Akron, OH on 9/20/2018

2006 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Amazing customer service. I went to a local store that installs radios and they couldn't figure out the correct harness for my truck. Within 5 minutes of talking to a Crutchfield technician, I had the right part and had it ordered. Part arrived quickly and the new radio is in and sounding great!

Pros:

Cons:

Crutchfield response on

0 of 0 found this helpful

Metra 70-8121 Amp Bypass Harness

Jerry from La Habra, CA on 4/9/2018

Verified customer (What's this?)
Verified employee purchase (What's this?)

2005 Tundra non JBL. Work well except the acc. wire was not hot on the factory harness. I just brought it up from the cigarette lighter and it worked fine.

Pros:

Cons:

Crutchfield response on 5/14/2018
Sorry for the accessory power dilemma, Jerry. On this vehicle, however, the wiring from the factory receiver/climate control trim panel must be reconnected when installing a new car stereo. This connection contains the accessory power needed for the new stereo. It's mentioned in step 8 of our exclusive MasterSheet instructions for the Tundra.

5 of 5 found this helpful

Metra 70-8121 Amp Bypass

Crutchfield customer from USA on 12/18/2017

2005 Toyota Tundra

Verified customer (What's this?)
Verified employee purchase (What's this?)

Long overdue item no doubt about it..Thank you Metra for supplying easy use equipment nobody else offers us "again". Bought this 2005 Tundra Access (extended) cab and this was the perfect solution to bypass my factory Toyota amp (Pioneer sticker on amp). NON-JBL UNIT ONLY...NOT 4 JBL.. Shame Pioneer/Toyota forgot to add any watts and speakers only 6" to the amp, you would think it would have power behind the 6 stack cd player they put in it too? Nope!! This system was a huge waste of time to even build imho and Toyota should be ashamed of it. Simply unplug oem "output" speaker plug from amp, snap this into the output harness itself and wire it back to receiver, done! I blame Toyota & Pioneer both due to what I know.. Pioneer has always been like burger king as they build exactly whatever a company asked for and still slap their name on it somewhere.

Pros: easy, simply unplug output from amp, snap this into output harness and wire it to receiver, done! I Removed old amp under rear seat. Long enough to reach back wall in crew cab 4 doors I had a few feet extra. For non-JBL units..

Cons: Hard to locate this harness. Not on Merta website to date?

Crutchfield response on

2 of 3 found this helpful

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