Originally Posted by Dirtydirt
Has anyone experienced a snapping or ticking sound in speakers for your radio? It changes speed but can't figure what is causing this annoying sound.
Tell us more about your rig.
Is it on the Workhorse Chassis? If so, popping noises that change with engine speed are indicative of a bad plug wire or faulty coil ground.
A whine that changes pitch with engine speed is usually caused by a bad rectifier diode allowing AC to cause noise. It can be filtered out by using a line filter (really just a capacitor) to pass the errant AC to ground. You can find out if that is the culprit by setting your VOM to ACV and looking for anything above about 15 VAC.