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Non JBL factory amp bypass

Discussion in 'Audio & Video' started by BigdaddyII, Jul 13, 2023.

  1. Jul 13, 2023 at 6:31 PM
    #1
    BigdaddyII

    BigdaddyII [OP] New Member

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    I’ve done away with the stock HU a couple years ago and installed an Alpine ILX-407 and just ran the factory speakers. I now have one blown and want to replace all of the speakers. I am reading that I will have trouble with the factory amp. I’ve looked and near as I can tell harnesses are available to accomplish this, but all have bare ends to add an aftermarket amp. I’m not interested in adding another amp, I simply just want to bypass the factory one and power the speakers with the HU. What are my options? Buy the bypass harness and connect the wires together?
     
  2. Jul 13, 2023 at 7:29 PM
    #2
    Tundra234

    Tundra234 New Member

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    Alot of them
    The dash speakers are powered off of the head unit. The door speakers run through the factory amp as you already know. What are you reading that is telling you that you will have trouble? I have never heard of that. Contact James @tech12volts. He is one of the audio gurus for our trucks.
     
  3. Jul 14, 2023 at 7:16 AM
    #3
    drpheta

    drpheta New Member

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    All you need to do with the aftermarket amp harness (AutoHarnessHouse.com Factory Amp Upgrade Harness AHH-4438) is splice the wires together. LR+input to LR+output, LF+input to LF+output, etc... terminate the ground, power, accessory wires, and plug in the harness. Now, you've bypassed the amp. There's a pinout on the forums and provided with the harness as well that will show you how to do this.
     
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  4. Jul 14, 2023 at 7:31 AM
    #4
    BigdaddyII

    BigdaddyII [OP] New Member

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    Awesome! That’s what I needed. Thank you
     
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  5. Jul 14, 2023 at 7:45 AM
    #5
    1lowlife

    1lowlife Toxic prick and pavement princess..

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    Yes, this.
    Should have been done when they/you installed the after-market HU.

    @BigdaddyII Just connect the speaker inputs to the amp to the speaker outputs of the amp and bypass it..
    I have an easy to read diagram somewhere that can help you, it might be tonight before I can post it up.

    I'll find it when I get off work tonight.
     
  6. Jul 14, 2023 at 11:23 AM
    #6
    BigdaddyII

    BigdaddyII [OP] New Member

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    Yessir, this is what I was thinking, just wanted clarification. I installed the HU and didnt know anything about an amp at that time. Frankly, I didnt know anything about it until I started looking around searching posts about replacing speakers yesterday. I thought because its non JBL that I didnt have an amp I guess.

    I did order the harness linked above already and will get to work on it as soon as it comes in. Truck is down for rack and pinion replacement so it may be next week before I cant get to removing amp and installing speakers. I appreciate any literature you can share.
     
  7. Jul 15, 2023 at 10:00 AM
    #7
    1lowlife

    1lowlife Toxic prick and pavement princess..

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    The color scheme of the diagram I wanted to post from the 2014 is different that your 2018.
    The old diagram I had was for the 2014.

    Here is a wiring diagram for your 2018.

    Just connect the appropriate output from the HU into the amp to the correct amp speaker output from the amp, bypassing the amp.
    Make sure to keep the speaker's popularity in order.
    Remember all 3 dash speakers come straight from the HU so there is no way to fade the dash from the front doors.
    This is why after installing 2-way components in my DC front doors, I disconnected all the dash speakers.

    Front Speaker Set is left and right dash, Stereo Component Speaker Assembly is the center dash, all 3 run off the HU

    Front NO. 1 is your front door speaker
    Rear speaker is rear door speaker
    You don't have a No.2 rear speaker since you have a DC, it is the rear door tweeter that runs off the HU in a CM

    upload_2023-7-15_11-50-2.pngupload_2023-7-15_11-50-16.pngupload_2023-7-15_11-50-37.png


    J144 and J145 are the plugs into the amp that you will be bypassing.


    upload_2023-7-15_11-55-51.png


    Any doubts just line up the pin number, to the left of the circle, in the appropriate plug.
    The A and B represent which plug it's referring to.



    upload_2023-7-15_11-59-2.png

    Hope this helps..
     
  8. Jul 15, 2023 at 6:08 PM
    #8
    BigdaddyII

    BigdaddyII [OP] New Member

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    I really appreciate this man. I do have the CM so I would have #2 rear door speakers. I ordered a set of speakers and my plans so far don’t include using the dash wiring for the tweeters. I plan to use existing door speaker wires to run to a crossover, and wire tweeter and woofer to the crossover. Same in the rears. I am undecided what to do about the center speaker. I understand that it will not work unless the wiring it is tied to is connected to the tweeters, we will see if I miss it.

    i am confident that this setup powered by the HUs internal amp will meet my needs, hell I was happy with the factory setup for a few years. If I do need a little more, I have the ability to add a stackable Alpine amp behind the HU and will go that route.
     
  9. Jul 16, 2023 at 5:59 PM
    #9
    BigdaddyII

    BigdaddyII [OP] New Member

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    Okay, so I may seem like an idiot here, but the 10 and 12 pin harnesses came in and I finally have a chance to look at them. The pin diagram I received with them is attached. All speaker wires are present in the 12 pin, the 10 pin only includes front speaker outputs along with power, ground and others I assume I do not need. I do see both outputs and inputs in the 12 pin harness, so I connect the outputs and inputs together within the same harness? If so, how does this work?

    IMG_5049.jpg
     
  10. Jul 16, 2023 at 6:15 PM
    #10
    drpheta

    drpheta New Member

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    10-pin #1: FR+ (output) connects to 12-pin #2 FR+ (input)
    10-pin #2 FL+ (output) connects to 12-pin #1 (input)
    10-pin #5 FR- (output) connects to 12-pin #7 (input)
    10-pin #6 FL- (output) connects to 12-pin #6 (input)
    Terminate 10-pin #s 3, 4, 7, 9

    12-pin #3 RL+ (input) connects to 12-pin #5 RL- (output)
    12-pin #4 RR+ (output) connects to 12-pin #9 RR+ (input)
    12-pin #8 RL- (input) connects to 12-pin #12 RL- (output)
    12-pin #10 RR- (input) connects to 12-pin #11 (output)

    I use crimps, as NASA and the FAA say crimping is far superior to soldering. Get a good crimping plier, and you'll be set to plug this in an bypass the amp.
     
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  11. Jul 16, 2023 at 6:52 PM
    #11
    BigdaddyII

    BigdaddyII [OP] New Member

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    Look about right? Yes, crimped and heat shrink.

    IMG_5050.jpg
     
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  12. Jul 17, 2023 at 5:22 AM
    #12
    drpheta

    drpheta New Member

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    That looks about right. Plug it in and enjoy your cleaner sounding door speakers, now that you have a proper head unit powering them.
     
    BigdaddyII[OP] likes this.
  13. Jul 20, 2023 at 5:34 AM
    #13
    BoatBroker

    BoatBroker New Member

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    How did this end up sounding after bypassing the amp? I'm thinking about doing the same things since I have an aftermarket Dasaita HU.
     
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  14. Jul 20, 2023 at 10:34 AM
    #14
    BoatBroker

    BoatBroker New Member

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    I'll answer my own question.. HUGE difference bypassing that POS factory amp if you have an aftermarket HU. I can't believe I had my Dasaita running through that amp for TWO YEARS!
     
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  15. Jul 20, 2023 at 10:40 AM
    #15
    drpheta

    drpheta New Member

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    Super easy, super cost effective, super worth it.

    I got rid of that stock amp within a week of getting the truck.
     
  16. Jul 20, 2023 at 11:08 AM
    #16
    BigdaddyII

    BigdaddyII [OP] New Member

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    I haven’t been able to do the bypass yet as the truck is in the shop having the steering rack replaced. Looks like you’ve discovered the reason for doing it though, thank you for the update. I can’t wait to find out for myself.
     
  17. Jul 20, 2023 at 11:49 AM
    #17
    BoatBroker

    BoatBroker New Member

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    You'll be very happy. On another note.. do you know what caused your steering rack to go out? I heard that is very expensive to have replaced.
     
  18. Jul 20, 2023 at 11:50 AM
    #18
    BoatBroker

    BoatBroker New Member

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    Did you remove it even with the factory HU or did you get an aftermarket HU a week after you purchased the truck?
     
  19. Jul 20, 2023 at 12:12 PM
    #19
    drpheta

    drpheta New Member

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    My truck came with an aftermarket HU
     
  20. Jul 20, 2023 at 4:57 PM
    #20
    BigdaddyII

    BigdaddyII [OP] New Member

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    I bought a new rack from rock auto and with shipping it was just above $500. Labor and fluids also just over $500. About $1200 for the whole job. I said fluids because I had to buy diff oil as well for the front diff. Being 4wd my understanding is that to have enough room to get the rack out you can either drop the front diff out or take certain pieces off the engine, dropping the diff being the easiest most straight forward option.

    My labor is no doubt cheaper than most shops as I use the mechanic at work. The trade off for that is that it will take longer than a shop as he does side work after hours.
     
  21. Dec 30, 2023 at 5:43 PM
    #21
    Savmikey47

    Savmikey47 New Member

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    Thanks to this thread. After market head unit and speakers. Sounds amazing
     
  22. Jan 13, 2024 at 2:11 PM
    #22
    ThatGuyTheCooler

    ThatGuyTheCooler New Member

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    Thank you for this super easy to follow tutorial. I did this bypass tonight and highly recommend
     
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  23. Jan 20, 2024 at 10:22 AM
    #23
    Cliffy34

    Cliffy34 New Member

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    Is this worth doing even if I have the stock speakers with an aftermarket headunit? I have the Sony XAV9500 ES from Trail Grid Pro
     
  24. Jan 20, 2024 at 3:38 PM
    #24
    drpheta

    drpheta New Member

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    If you're still using the stock amp, yes
    Bypass that thing so that the speakers get the signal directly from the headunit.
     
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  25. Apr 28, 2024 at 10:10 AM
    #25
    GRay75

    GRay75 New Member

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    Could I somehow t splice into the bypass harness to run to the outputs of a new amplifier and will it bring that amplified signal too the speakers through the existing wiring.
     

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