Engine RPM sound from Radio
 

Ever since I bought this car it has has a hand full of electrical problems due to corrosion (previous owner left hood open during a rainy afternoon) and rodents.

I have soldered in wire splices to fix the rodent damage here and there.

The thing is that the AM radio picks up a wide range of frequencies that match the engine rpm and the speed.

yes, I can tell how fast I'm going by listening to one AM whine and the rpms by listening to another lower pitch whine.

I been researching the problem and my research all points to either a bad ground on the alternator/engine/firewall area or the rectifies of the alternator going.

I can also rule out my stereo system because I cab pickup the same frequencies with a handheld receiver.

so:

Could it be a sign of a imminent alternator death?

Could it be that I have a chewed off ground thanks to rodents?


I know weird things happen with a bad ground.

Ground.

BTW, is there still AM stations broadcasting?

From where you think?

Yeah I can still hear some AM stations, but all have the annoying AM noise.

Is any of the original suppression gear still in the wiring system ? Sounds more like that