got my sirius satelite radio hard wired into the radio in my 70. It works, but there is a whirring sound that gets louder and higher pitched with engine rpms. It appears the radio setup doesn't like the 502 or vice versa :)

any ideas how to cure this? is it simply a ground problem? or can some type of noise suppressor be added?

thanks

Both ignition and alternator can cause this. Radio Shack has a 'noise filter' you can hook onto the power wire to your radio. It will silence most of the noise.

Both ignition and alternator can cause this. Radio Shack has a 'noise filter' you can hook onto the power wire to your radio. It will silence most of the noise.

cool, I'll go down to the shack and pick one up, thanks!

You may have underlying problems. Most radios wont receive interferance any more unless you are using copper core ignition wires. You could have a poor ground for the stereo in any part of the system, including any amps, or equalizers. You may also have a diode going bad in the alt. Another cause could be if you have any of your signal wires IE: rca wires or speaker wires, near power wires wether it be positive or negative you will receive the signal.

I had a stero go bad over night one time, and this was in my '05 Dodge Ram. I parked the truck. The system only had one component other than the stereo and that was an older amp. So I go to get in the truck for work and it was horendous (sp). After doing some research, I found the stereo on a list of stereo models that were known to loose grounding cirucitry inside the stereo. I tried the filter, but it didn't get rid of it all. So back to research. I found a place where it said to try to ground the RCA wire outter connections dreictly to the stereo outter housing, and BAM it was gone. This meant the inner grounding circuitry was in poor shape. I iliminated the amp and that did nothing. I took the truck to the dealer (under warranty) they said nothing was wrong with the alt. So I replaced the stereo that day, and had no more problems.

The filter is a bandade, if it works and you are ok with it use it, but I would try to find the actual cause of the radio noise.

hmmm....well I bought one of those repro digital guts type radios from vintage audio radio. No amp, no EQ, just the radio.

hooked directly (hardwired) to it is the sirius unit and my cd changer is a FM modulated pioneer unit that uses a FM signal to broadcast onto the radio.

I'm also going to call Steve at vintage to see what he thinks. too close to power wires huh? damn, now I'll have to take the whole dash apart. grr :(

found out I can get to the radio without removing the dash so I am going to try adding an additional ground first (the ground is now run from the radio to the dash bracket) I'm thinking that the bracket might not be good enough ground? perhaps the firewall would do better?

If that doesn't work I'll try grounding the RCA connectors to the radio body.

Any other suggestions on this? My engine is a GM ZZ502 crate (deluxe assembled) with HEI

http://www.gmperformanceparts.com/Parts/part_detail.jsp?cat=ENG&sku=12496962

Are you running a MSD unit? Gary

The big blocks make lots of noise. The first thing to do is to pull the antenna and see if the noise goes away. If it does, the noise (RF interfereance) is being radiated into the air and recieved by the antenna. The front end of the reciever is very broadband before the filters and will hear everything.

If the noise does no reduce when the antenna is disconnected then it is coming in through the positive wire. Try to put a filter as close to the radio as you can, connected to the DC radio line.

Good luck and let us know how it goes.
Chuck

Another thing I though about... Make sure you have a ground strap from your engine to the fire wall