If it uses the chassis ground for the speaker negative you're OK. I'll look into grounding the chassis of the stereo and see what happens. but that was a problem because BMWs don't have a consistent/level ground all throughout the body of the car. If it's a stock unit and it can use the chassis ground chances are it's already wired that way. Many car stereo wiring harnesses will have a screw type connector at the end of the ground wire.

or maybe its the 12v wire and not the ground thats damaged, did you check the fuse in the car fusebox to make sure you didnt blow it on installation, have you metered the 12v coming from the car wiring loom into the red and yellow wires on the stereo to make sure the ignition key switched the power on to the correct wires? The one from my car's factory stereo was not strong enough. It helped with the initial noise that was coming from the subwoofer rca.

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That depends on the amplifier.

Cons: car frame material has a larger resistivity than a copper wire, car frame has many materials connected such as rubber so ground current may have to bounce off several materials to make it back to the battery ground, other devices are using the frame as the ground so maybe it could cause some interference. Mar 3, 2000 11,552 191 106. But that noise has dissapeared and this new noise has conjured itself into my #3 and 4 channel of the other amplifier only when the car is running.

This is one of the more obvious signs of a bad ground, manifesting in much the same way as a loose battery cable or a dead battery. anyway, the problem that arose was he installed per the instructions, grounding the dc/dc box to chassis, somewhere near the box. I really think its the ground. Under the dash (many wires) and the ground strap attaching the engine block to the chassis are common ones in older cars. If for some reason your current stereo was not grounded through a wire (the diagram on the back of the wiring adapter kit will tell you) you can ground the car stereo by finding a screw under there to which this wire can be attached.

There are scores (or more) of grounds in a car and when one of them gets loose it can cause all kinds of weird problems. S. Spoooon Lifer.

When you attempt to start your car, you may hear a single click or a rapid tapping; this is the sound of the starter's solenoid opening … But most high powered units do not reference the speaker negative to ground. I had to ground it to the car chassis. \$\begingroup\$ @KyranF Have to disagree, unfortunately. oh a ground loop isolator, yeah I've got one and it is not helping.