I have had 3 1994 GMC half tons and none of the radios work on am and fm channels, there is always static noise. How can this be fixed? Is it the antenna or the radio itself?
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old post, and my first radio noise post.
im an old radio guy USN, and ex ham.
Q1: AM or FM? (even on cassette or CD?)
1: bad antenna, and for sure, there are upgrades !
2: too far from station, AM is worst for static, but FM has shorter distance for same station power. (I heard XERB in VietNam! AM)
3: bad radio. (rare for both am and fm bad)
4: bad alternator can sing, play with throttle and it sings higher for higher RPM bingo. stop engine, singing gone?, bingo. Alternator.
5: and last ignition noise, so stop engine still have ignition popping sounds. no more? , then Ignition noise, clicks or pops. (spark)
6: noise has 2 sources , radiated or conducted.
if conducted on power line, 12v to radio , we can buy a filter to stop that.
older cars do this. what year is yours. a honda what a 73 civic?
Get your hands on another am antenna....any one will do and attach it to your radio. If that clears it up replace the wire and antenna. If that does not then move to the radio as the suspect. The other thing I need to ask is how long have you had the car and has the AM worked on this before?
Yes Most modern radios have a built in antenna for am. so the one on the outside of your car is the fm. Sound like either the cable to the radio is broken or has become disconnected. You should be able to pull the radio out far enough to see the cable, it's the big black on, and determine whats up.
You should be seeing BCM trouble codes (DTCs) for the radio with a code reader. I am assuming you are hearing something (noise) from the speakers with the radio on. If so, you may have lost the programming in the radio - you could try re-flashing it. However, that radio has a number of memory locations that are set whenever the radio is turned on - one or more memory modules in the radio may now be faulty.
When you have a problem with these, it is almost always best to just get a good used one. You can find a ton of them on ebay, or your local wrecking yard. They are easy to take out and put back in as long as no one has messed with it in the past.
A static on AM is just interference. Similar to operating a mixer when you are watching TV. You would remember the grains in the TV but no audio disturbance because, video is AM transmitted and audio FM transmitted. A static on AM radio could be due to many factors in the car. The ac system, the music system itself or the engine rpm. The solution does not lie in finding out which is creating the noise, it lies in insulation. Check the antenna and change it if needed. That should fix it.
two types of noise accur on radio's first is known as a whine,, goes up and down with engine rpm secound is static...normally static is from bad plug wire or plug... you probably have coil packs.. one of them could be arcing.. check it out in the dark of night and look for the spark light. most time good tune up fixes let me know
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