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Car speakers and ground wires

My speakers have a really bad humming noise and I have an extra batterie in my trunk with my positive wire going from my under hood batt. to my trunk batt. then my ground from the trunk batt. to under the car the a shorter ground going to a self tapping screw in my trunk. But now when my system hits it makes my batt. gauge needle jump back and forth and my head lights go dim. What is the problem?

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  • 290 Answers

  • What gauge is the wire used to route your battery + and - ?
  • What does audio your system consist of?
There could be several things happening. The hum is most likely from a ground loop or bad ground of some kind. Search the web for a "ground loop isolator" and pick one up.

The dimming sounds like there's just too much draw on your batteries for the wiring and system that you have. If the wire used to connect amp to battery and battery to battery are too small, there will be too much voltage drop in the wire. Plus, if your system is giant, you may have to add a 1 farad capacitor (or larger) or a high output alternator to your system to keep up with the power draw by the amp(s).

Posted on Mar 18, 2008

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Posted on Jan 02, 2017

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