Tuesday, February 14, 2012 - 04:38 am, by: Niall Hughes(Hughezy_10)
Hi guys,
I have suddenly developed a problem with my stereo. One day I got in the car turned on the radio and turned the knob a third of the way round and the sound had gone ridiculously low compared to what it normally is at that level. I have to now turn to double to get the same level of sound that I did previously and I don't know why.
One problem I have is that the EMV screen is blank so I can't see my settings, although I removed the car battery to try and reset everything and it remained the same. Everything in the car is stock and before this had happened everything was loud and clear.
Tuesday, February 14, 2012 - 02:16 pm, by: Aiden Cheese(Chillpen)
That's ground loop.
It means that either something that shouldn't be earthing is, or something that should be earthing isn't. Either way it's now getting interference from other electrical systems.
Tuesday, February 14, 2012 - 07:26 pm, by: Mike Triggs(Mikeandimah)
Niall Hughes wrote on Tuesday, February 14, 2012 - 07:05 pm:
Thanks Aiden I will have a look today. Do you know where the earth for the amp would be? Im a bit of a rookie at electrics.
The amp (and Stereo) will have a wire which is part of the loom, which is usually black (sometimes with another colour added, but not often). This should be be traced back to a junction, it should go off to an earthing point somewhere on the chassis. Since your problem has had a sudden onset, it's quite possible that an earthing bolt has come loose or broken.
Wednesday, February 15, 2012 - 12:22 pm, by: Aiden Cheese(Chillpen)
Sorry mate i'm not so good because I've removed all that stuff.
My advice would be to have a look at earthing points in the boot or earthing points behind the head unit. Look especially close to places where the wires might be rubbing against something, or a small tiny bolt has come loose after 15 years of being jiggled.
Ground loop basically is when the electricity finds other pathways to earth rather than the natural, intended one. So with that knowledge you can somewhat guess at places. Or just even make new earths as the contacts could just be corroded etc. But if it was sudden onset it could be something loose.
Evan Kaio DieHard "Beautiful sunnny, (our Coach sacked most of our All Blacks) 'Canes' country '91 UZZ31. 92 TT
Wednesday, February 15, 2012 - 05:18 pm, by: Evan Kaio(Knave)
Swap out your tuner and DSP (under the rear seat, LH side) for a known working pair. This should solve the quiet volume problem. It may solve the high pitched whining noise.
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