Alternator noise filter
Le Mans Master
Joined: May 2003
Posts: 8,876
Likes: 3,556
From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
On AM only? It's more likely RFI- "radio frequency interference"-caused by dist/sparkplug/wires/ missing shielding.
Before wasting a bunch of time try to clean up the alternator noise -AKA "AC whine"- simply disconnect the plug into the alternator- start up the car- if the noise is still there - then it is from your ignition system.
Richard
Before wasting a bunch of time try to clean up the alternator noise -AKA "AC whine"- simply disconnect the plug into the alternator- start up the car- if the noise is still there - then it is from your ignition system.
Richard
Last edited by Richard454; May 24, 2019 at 09:34 PM.
Instructor
Joined: Jul 2011
Posts: 109
Likes: 3
On AM only? It's more likely RFI- "radio frequency interference"-caused by dist/sparkplug/wires/ missing shielding.
Before wasting a bunch of time try to clean up the alternator noise -AKA "AC whine"- simply disconnect the plug into the alternator- start up the car- if the noise is still there - then it is from your ignition system.
Richard
Before wasting a bunch of time try to clean up the alternator noise -AKA "AC whine"- simply disconnect the plug into the alternator- start up the car- if the noise is still there - then it is from your ignition system.
Richard
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
The noise you are hearing in the radio could be ignition noise and/or alternator noise in the DC electircal system. Simple condenser (capacitor) filters were used by GM to stifle that noise, along with ignition system shielding. If you still have the Delco radio in your car, putting filter capacitors on all the motor, switch and alternator circuits might fix your problem. You could buy just one noise suppressor capacitor and stick it in the alternator line just to see if it solves your problem. There was one on the blower motor, turn signals, flasher module, and brake switch, as well. Only install those that are needed for you listening pleasure.
