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379 Peterbilt subwoofer troubles

Discussion in 'Trucks [ Eighteen Wheelers ]' started by sasky379, Feb 5, 2018.

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  1. Feb 5, 2018 #1
    sasky379

    sasky379 Bobtail Member

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    Feb 5, 2018
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    Hi to all. First time posting so hopefully I have this in the right forum.

    I recently installed an aftermarket deck in my truck to replace my concert class Delphi radio. I got an adapter harness for it but it only came with one plug that covered all the basics. My radio had two plugs on the back, the second plug on the back has three wires that I'm not sure where they belong. Does any one know where these wires belong or what they do?

    I've also noticed my factory subwoofer under the bed doesn't work. I'm not sure if it was working prior to the radio swap or not. The plug to the sub has 4 pin connector (2red and 2 black) and checking with a test light 2 have power and 2 do not (1red and 1 black have power). Does anyone have any tips on getting this thing working.

    Thanks for any help
     
    sasky379, Feb 5, 2018
    sasky379, Feb 5, 2018
    #1
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  3. Feb 5, 2018 #2
    pushbroom

    pushbroom Road Train Member

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    Sep 1, 2012
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    Whats the last 6 of your s/n. We can get you some diagrams
     
    pushbroom, Feb 5, 2018
    pushbroom, Feb 5, 2018
    #2
    SAR Thanks this.
  4. Feb 7, 2018 #3
    sasky379

    sasky379 Bobtail Member

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    Feb 5, 2018
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    Last 6 are 816977
     
    sasky379, Feb 7, 2018
    sasky379, Feb 7, 2018
    #3
  5. Feb 8, 2018 #4
    pushbroom

    pushbroom Road Train Member

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    Here are some things to take a look at. It lists the 3 wires as signal to the amp and 2 wires for the sound.
     

    Attached Files:

    pushbroom, Feb 8, 2018
    pushbroom, Feb 8, 2018
    #4
    Sid C Angel and SAR Thank this.
  7. Feb 9, 2018 #5
    sasky379

    sasky379 Bobtail Member

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    Feb 5, 2018
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    Awesome thanks I'll have a look at that.... makes it way easier with those schematics
     
    sasky379, Feb 9, 2018
    sasky379, Feb 9, 2018
    #5
  8. Jun 18, 2020 #6
    Freddy74

    Freddy74 Bobtail Member

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    Jun 18, 2020
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    Hey.. in 2015 386.. ser# 258772. Would you also be able to tell me amp location and power spec ratings etc ? Or even the pages that discuss the system. Looking to upgrade and deciding what to keep etc. Flyfishingdude on the G mail place... tks.
     
    Freddy74, Jun 18, 2020
    Freddy74, Jun 18, 2020
    #6
  9. Jun 19, 2020 #7
    pushbroom

    pushbroom Road Train Member

    1,777
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    Sep 1, 2012
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    Truck is actually a 2015 348 medium duty unless the serial number is incorrect. No amp on it, just head unit to speakers.
    If you want a good system ditch everything and start fresh
     
    pushbroom, Jun 19, 2020
    pushbroom, Jun 19, 2020
    #7
  10. Jun 19, 2020 #8
    Freddy74

    Freddy74 Bobtail Member

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    Jun 18, 2020
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    Dam. Sorry. 258722... my bad thumbs.. According to those diagrams it shows all speakers at 2 ohm which is weird and 4x6b and 6" all are mid bass? Are they choked at the speaker or is there a crossovrer point on the amp itself? Whole setup seems strange ...lol.
     

    Attached Files:

    Freddy74, Jun 19, 2020
    Freddy74, Jun 19, 2020
    #8
  11. Jun 22, 2020 #9
    pushbroom

    pushbroom Road Train Member

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    Truck is a 2015 367 not 386.
    If you intend to do a system upgrade, best start from scratch with a new head unit and amp...
     

    Attached Files:

    pushbroom, Jun 22, 2020
    pushbroom, Jun 22, 2020
    #9
    spsauerland Thanks this.
  12. Sep 7, 2020 #10
    KWade14

    KWade14 Bobtail Member

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    Sep 7, 2020
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    Could I get the audio diagrams for an 18’ 388? Vin 266368. The speakers and subwoofer neither one are working
     
    KWade14, Sep 7, 2020
    KWade14, Sep 7, 2020
    #10
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