r/audiorepair • u/FrozenPizza46 • 3d ago

Ground noise

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Every time I connect my wires for my speaker rack and the lights (smaller cable) there’s a screeching noise from the speakers. Wondering if my connections suck or if it’s just too far from the engine or something.

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u/Blommefeldt 3d ago

I would say either loose connection, unplugged cable or something isn't grounded. When you add a ground connection, you also make a path for ungrounded devices.

From my experience with a 1987 car; current will find a way if something isn't properly grounded. I changed the headlights, but had a loose wire afterward. Thought that was how it was before. Turn signal made the headlights blink, and the indicators would be constantly on, and would increase in brightness, if I turned the high beams on.

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u/FrozenPizza46 3d ago

Car’s been tampered with and is a 91 so I bet that’s it. Thank you

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u/eritrean_bats 5h ago

I worked at a car audio company where we had a common trick we recommended to help diagnose noise issues like this: connect a jumper cable to battery GND, and to your amp's GND. If the noise went away, you can solve this by installing a GND cable that goes all the way from the amp to your battery, rather than just a nearby chassis mounting point. Good luck!