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    juckstapose's Avatar
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    Amp Not Powering On After New HU Install

    I switched out my head units today - a swap from a Pioneer 860mp to a Pioneer 780mp. Since the harnesses were the same, I did not disconnect the battery. When I got everything all plugged back in, the HU works perfectly, but now my front amp is not getting power. It's not in protection mode, there is just no power I tried disconnecting and re-connecting the battery, and I checked to ensure that the remote turn on was properly connected. All connections on the harness are good. I tried disconnecting the RCA's and I turned the gains all the way down. No go.

    Any ideas? Maybe a blown fuse? What can I do to test?

    Thanks!



    I'm friendly, but ashamed of my car stereo.




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    WOT's Avatar
    WOT
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    Re: Amp Not Powering On After New HU Install

    You sure the harnesses are exactly the same? My guess would be the remote is different pin on the new HU.

    First things to check
    -remote wire voltage @ headunit
    -remote wire voltage @ amp
    -power wire voltage @ battery
    -power wire voltage @ amp

    Few quick and easy checks




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    Cpyder's Avatar
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    Re: Amp Not Powering On After New HU Install

    Quote Originally Posted by WOT View Post
    You sure the harnesses are exactly the same? My guess would be the remote is different pin on the new HU.

    First things to check
    -remote wire voltage @ headunit
    -remote wire voltage @ amp
    -power wire voltage @ battery
    -power wire voltage @ amp

    Few quick and easy checks
    Ditto. Check Power wire voltage compared to the ground terminal and then to a ground of the car. They should be exactly the same.




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    juckstapose's Avatar
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    Re: Amp Not Powering On After New HU Install

    Thanks for the help! I checked the harnesses pretty carefully and after a lot of frustration I found that the scotch lock I used to tap the ACC wire was ever so slightly loose. It was a little weird because I got power to one side after I took the fuses out of the amp to test and re-installed after they were both showing continuity.

    So I think there were two issues... Anyhow, I am hooked up [somewhat] reliably and everything seems to be working now that it's all put back together - phew...



    I'm friendly, but ashamed of my car stereo.

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    Elton's Avatar
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    Re: Amp Not Powering On After New HU Install

    theres one reason i like to solder wires



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    juckstapose's Avatar
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    Re: Amp Not Powering On After New HU Install

    I always make a crazy mess when i solder - guess that's the beauty of practice, but I don't get much time for this stuff...



    I'm friendly, but ashamed of my car stereo.

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