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Thread: Aftermarket radio woes

  1. #1
    Join Date
    Nov 2010
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    bakersfield,Ca
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    Aftermarket radio woes

    first off let me say i have read all the articles i can find on this forum and others. despite other people fixes they have failed to work for me. this is my first ever aftermarket radio.

    i have a 97 disco(manual trans) that i replaced my not working stock head unit with a new aftermarket radio. i heavly researched ordered all recommened install harness adapters. after installing said radio with key off i hear a whine that follows the blower motor. key on engine running i have a louder whine that follows engine rpms. first thing i thought crap i have a bad ground. only able to find one ground(front battery neg. to rh front frame rail) i checked it, no ohms, voltage drop, good check ground from frame to terminal at frame good. since i only found one ground i added three grounds various places ensuring good chassis and body ground. still a whine. i read that a ground loop isolator SHOULD be the last resort. so i caved in and went to radio shack installed the g.l.i. what do ya know it didnt fix anything same exact noise. i then thought to splice into the radio ground in between the aftermarket radio harness and adapter harness to a good ground on trans tunnel. nothing. test alternator with a vat40, no bad dioeds 89a output. also tried grounding out rear amp to chassis and battery by spliching in to amp ground. double and triple check wiring. the adapters only use two of the factory plugs. one goes to the 4 rcas on the radio other i soldered in to radio harness per wiring diagram i got with radio. so what am i missing?
    Last edited by 97discosd; 10-03-2012 at 01:27 PM.

  2. #2
    Join Date
    Sep 2009
    Location
    Loomis, Ca
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    831
    When i had my aftermarket deck put in the shop that did the install had to bypass the rear door sub amp because it was causing problems. something to check
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  3. #3
    Join Date
    Nov 2010
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    Well I've already found that if I disabled the rear amp by cutting the blue wire(amp power on) the noise is gone. But I get no audio at all from speakers (ie music ect).

    I may have no choice but eliminate the rear amp and hard wire all speakers to radio. I'm hoping to not have to do this.

    No one else had ran into this?

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  4. #4
    Join Date
    Sep 2006
    Location
    Roseville CA
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    102
    On mine I found that the factory wiring was picking up the interference.
    So I ran new speaker wire down to the amp connector and spliced in there, bypassing the amp.
    I also ran a separate amp for the rear subwoofer. (which I rewired to mono from stereo.)


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  5. #5
    Join Date
    Jul 2010
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    Ripon, Ca. (That's not England chaps)
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    Quote Originally Posted by 97discosd View Post
    Well I've already found that if I disabled the rear amp by cutting the blue wire(amp power on) the noise is gone. But I get no audio at all from speakers (ie music ect).
    I think it's odd that cutting the power supply to the rear amp kills all speakers output. I'd have a difficult time designing a system that would have that ability.

    There's a reason the Stereo Installers run all new wiring. Many problems are cured and avoided with new, properly sized/shielded/routed wires.

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  6. #6
    Join Date
    Nov 2010
    Location
    bakersfield,Ca
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    31
    Haha I agree. I currently finding all parts needed to "properly" wire everything in to radio.

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  7. #7
    Join Date
    Jul 2009
    Location
    Arizona
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    151
    That sucks. I just ran all new wiring (larger size anyway) and RCA's to ensure I knew every little wire issue that could go wrong.
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