Static/noise thru speakers

[HDMCKNETT]

I get a lot of static/noise through my speakers when the antenna is going up or down and when my wipers are working, loud enough to completely drown out the radio. Any suggestions? (I have a '92)

 

[projectSHO89]

Probably a bad cable from the antenna to the radio.

Is it especially bad on AM stations? Try going under a bridge or overpass while on an AM station (not too strong of one). If you then pick up alternator whine and electrical noise from the blower motor, go for the cable.

Chances are, the shield has corroded away from the ground terminal that mounts to the antenna.

Other possibility is that you have lost the ground connection at the antenna end for some other reason (usually corrosion).

Pull the radio out, unplug the antenna cable, and measure the resistance between the outside portion of the terminal to a good chassis ground. It should be a dead short. Anything over a few ohms is bad, if open, replace the cable. I used one from a junkyard SLO, cost me a buck.

Steve

 

[smacd]

Also, check your ground connections (particularily those around the battery at the rad support) for corrosion. A bad ground could also cause interference in the radio.

 

[96lt1]

noise thru speakers can also be cause by too many ground points. as those ground points corrode they lose connection and start to cause static

 

[projectSHO89]

noise thru speakers can also be cause by too many ground points. as those ground points corrode they lose connection and start to cause static

Must be some kind of new math. That situation should result in LESS ground points.

Bad grounds can cause noise in audio systems because when the ground contact is lost, that lead then becomes an antenna, allowing other electricalnoise/RF signals to be picked up, rectified, and amplified.

Steve

 

[Larry N Johnson]

Where would a person look for bad ground points?

I changed the battery and ever since that, have static in the audio system

 

[rubydist]

The other place I have had issues is when the metal hood was not grounded to the chassis. Of course, fiberglass hoods would not have this problem.

 

[blk\blk90]

Holy thread revival batman!

 

[sperold]

There is a small capacitor thing attached to the coil that suppresses noise in your audio system.

Does not explain the wiper and antennae issues in post one, but is worth a look for general interference.