Anyone have problems with lights after stereo install?
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This is a discussion on Anyone have problems with lights after stereo install? within the Electronics/Car Audio forums, part of the Interior Mods category; I just had 4 speakers, head unit, and 2 subs installed in my 2007 wrx limited, now my headlights have ...

  1. #1
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    Anyone have problems with lights after stereo install?

    I just had 4 speakers, head unit, and 2 subs installed in my 2007 wrx limited, now my headlights have a flicker or don't turn on sometimes. Any ideas on what might going on with them?

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    The Guy On The Couch TownLine500's Avatar
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    I would check your car fuse panel see if any are burnt. Check the power wire fuse for your amp to.
    It's most likely a short in the wiring harness. If you had them installed professionally I would call them tell them what is happening.
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    Registered User Nayrb37's Avatar
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    Are the flickering or struggling to turn on all the time? Or are they kinda of flickering/dimming when the volume is high?

    If the latter, that usually means the system is pulling too much power from the battery, either the wire gauge is wrong or your alternator can't handle the extra power consumption. Subaru's factory alternator is pretty weak.
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    Registered User drumbeat's Avatar
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    Make sure you have a good capacitor on those subs and that your ground is solid to the frame unless you decide to upgrade your alternator or run an independent battery and alt

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    Registered User AYSE's Avatar
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    Double and Triple check all your wires and connections. Chances are its a short or a poor connection somewhere. Check your ground, did you sand it/ scuff it up if its was attached to a painted surface? Since its an intermittent issue I would not assume right away that its a fuse. Sounds to me like a loose connection honestly.

    Quote Originally Posted by drumbeat View Post
    Make sure you have a good capacitor on those subs and that your ground is solid to the frame unless you decide to upgrade your alternator or run an independent battery and alt
    Dont worry about a capacitor, this issue shouldnt be related to power drawing from your electrical system (unless of course these issues only occur at high volumes).

    If you plan to eventually upgrade your electrical consider this.
    - Big Three Upgrade: There is plenty of info on the web that you can familiarize yourself with. A quick explanation of this is basically- Upgrading key wires that go from the neg terminal on your batt to chassis ground, putting a larger wire (1/0 awg) going to your alternator, and your engine ground. This will allow more current to flow freely rather than bottleneck in the wire. This is a cheaper option than an upgraded alternator and would consider this as a supporting mod to prepare for a new alternator too!
    - Yellow top Optima battery: You can replace your stock battery with a deep cycle batter. They crank out much more power and again, its a cheaper and easier alternative to running a second battery.

    all that being said, it really comes down to how much power you are continuously drawing from your car. If you are drawing around 1000- Maybe 1400W RMS, then I would say you dont need the extra battery and/or the new alternator..

    But before you start replacing stuff and buying new stuff, try to figure out where the current problem lies in your electrical.

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