Trying to figure out the cause of feedback/interference that is coming through radio. It's a whining noise that increases with RPM. The noise has been present for about a year but its starting drive me nuts. Any ideas?
Could give this a try?You need a noise suppression choke coil on the power supply line, try radio shack.
I originally ran the ground straight to the chassis out back but started having issues with odd codes. I then took a high quality, 600V, 2/0 AWG, welding cable and ran it straight to the motor on the opposite side of the power cable which is ran inside the car and the ground is ran outside. I did this to eliminate any ground loop issues and all the electronics seem to work better/correct and the codes are gone, my tuner suggested this.
I will check the alt for AC ripple with my volt meter. If you have limit spec for this that would be helpful, if not I'm sure I can find something.
One thing worth noting is the harmonic balancer was increased in size by 15%. The reason I mention this is because the alt is now over driven 15% at any given RPM. With the factory balancer the noise was always there but only at higher RPMs. The whining noise is now audible a lower RPMs.
I did just that.The heavy cable will help with returning starter currents to the battery but you'll still want to tie the chassis to the battery using, say, an 8- or 10-AWG to provide a low-inductance ground return from the chassis.
I have a good scope at work so I will use it.As well, if you can, use a scope to measure the ripple because many DVMs may not be able to accurately measure non-sinusoid ripple. The issue is that most meters with an "AC" setting are designed to measure a true sinusoidal waveform and will report incorrect numbers for what amounts to 0.5V of peak to peak noise on a 14V DC offset.