Check your RCA audio cable to be certain that it is not too close to any electrical sources. 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. Suffice to say that this thread should remain an "earthy" conversation. Some of the ground experiences I've had would not lead you to a bad ground. 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. 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. Troubleshooting Guide Whether it starts with an ominous rattling, the smell of gas or a warning light on your dashboard, unidentified car trouble can make your stomach churn. The Car Audio Help DVD catalog includes five different videos covering many areas of car audio installation and custom fabrication. The slight smell came back even after switching the amps. 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. I then started to experience the subwooofer fading in and out at times. The first reason is that the ground connection is vital to the proper functioning of your car’s electric and electronic installation. Symptoms of a bad engine ground in any car are flaky operation of the entire electrical system. Choose your car’s symptom to learn what could be wrong and how to fix it. 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. Topics range from basic system installation (head units, amplifiers, speakers, etc.) Why? The purpose of this thread is to document the symptoms and experiences with ground problems. 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. and mobile security (car alarms and remote start) to subwoofer box design and fiberglass fabrication. your car aerial connector also acts as a ground, so if … 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? That is not the case. Make Sure You Have a Quality Ground Point. Noticing and recognizing bad ground connection symptoms is crucial to solving this issue in your car. Bill Robertson has an excellent thread on creating a ground … Many think that as long as the accessory’s ground wire is touching some part of the vehicle, it is grounded. 7 Common PCM Failure Symptoms. At the first install the ground was bad so i moved it and scraped the paint. 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. One time it went completely silent and after turning the car on and off the sub came back on. 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. Some car audio problems that are commonly attributed to amps include sound distortion, no sound at all, and even bizarre sounds like farting. And bad grounds can lead to all sorts of problems. If so, move the RCA cable away from the power source. 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