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floating ground

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  • floating ground

    i dont know if i have this the wrong way around,but i am interested in finding out if my car has a floating ground on the stock harness,so are newer cars or older cars more likely to have a floating ground stereo?

  • #2
    Isolated grounds

    Car stereo units have had isolated (non-earthed) audio spkr connections since the early 80's. This reason for this is twofold. One is to stop earth loops for noise etc, but mainly because the output stages in the radio are isolated from the spkr case which is normally connected to battery eth.
    The units then need to have both the power and return wires run to the spkr or amp.
    You can install an isolation unit between the spkr and the amp which then allows the spkrs to be connected to battery negative, but this can lead to problems. Easy to check. Connect multimeter from spkr neg wire to chassis. Is open reading then isolated. If short, not