From timing to tire pressure, you had to keep an eye on every aspect of your vehicle, and it was routine for mechanics to give your car a “tune-up” along with your oil change. The first reason is that the ground connection is vital to the proper functioning of your car’s electric and electronic installation. The slight smell came back even after switching the amps. and mobile security (car alarms and remote start) to subwoofer box design and fiberglass fabrication. At the first install the ground was bad so i moved it and scraped the paint. Why? Check your RCA audio cable to be certain that it is not too close to any electrical sources. your car aerial connector also acts as a ground, so if … Choose your car’s symptom to learn what could be wrong and how to fix it. Some of the ground experiences I've had would not lead you to a bad ground. Suffice to say that this thread should remain an "earthy" conversation. Many think that as long as the accessory’s ground wire is touching some part of the vehicle, it is grounded. If so, move the RCA cable away from the power source. Some car audio problems that are commonly attributed to amps include sound distortion, no sound at all, and even bizarre sounds like farting. My brother installed a radio in a Ferrari many years ago and was amazed to find it only worked when the parking brake was on. I then started to experience the subwooofer fading in and out at times. One time it went completely silent and after turning the car on and off the sub came back on. 7 Common PCM Failure Symptoms. So if you have info to share, chime in. And bad grounds can lead to all sorts of problems. That is not the case. Some of this can be caused by a broken amp, but all of them can be caused by other underlying issues that will still be around if you try to fix the problem by throwing a new amp at it. Noticing and recognizing bad ground connection symptoms is crucial to solving this issue in your car. If these points become loose or corroded, the ground now has a much higher impedance path, or an intermittent situation develops, causing loss of signal and increase of noise. Make Sure You Have a Quality Ground Point. The Car Audio Help DVD catalog includes five different videos covering many areas of car audio installation and custom fabrication. As you already know, an amplifier's speaker output generally has one speaker wire with the audio signal and another (the reference) which is connected to the audio ground inside of the amplifier. The purpose of this thread is to document the symptoms and experiences with ground problems. A common point of failure is a mechanical connection to the chassis (as in some jacks and pots) which provides the signal ground path rather than a soldered wire connection. Not too long ago, all of our cars’ systems were manual. Bill Robertson has an excellent thread on creating a ground … 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? A bad ground can cause noise in an audio system, make electric fuel pumps run hot or produce low pressure, and make electronic engine controls do weird things. Topics range from basic system installation (head units, amplifiers, speakers, etc.) Symptoms of a bad engine ground in any car are flaky operation of the entire electrical system. Improper grounding leads to system or line noise but it could also be the proximity of the audio signal cable to the power cable or some other electrical device of the car. 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