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Car Radio Problem, Help

Tbar220 From United States of America, joined Feb 2000, 7011 posts, RR: 28
Posted (9 years 9 months 3 weeks 5 days 16 hours ago) and read 1019 times:

Here's my problem. My AM radio in my car has decided to glitch on me. When my engine is on, the AM radio barely comes through an unbelieveable amount of static. Yet, when my engine is off, the AM radio comes through loud and clear. I don't have this problem with the FM. Does anybody know what might be the problem, and what do I need to do to fix it? Thank you.

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7 replies: All unread, jump to last

L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62
Reply 1, posted (9 years 9 months 3 weeks 5 days 15 hours ago) and read 1011 times:

You are picking up interfence from the ignition system of your car.

My first suggestion is that you look at all their wires between your radio and the antenna and see if any have their insulation worn through.

[Edited 2003-08-03 08:47:29]

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Ybacpa From United States of America, joined Feb 2001, 1108 posts, RR: 1
Reply 2, posted (9 years 9 months 3 weeks 5 days 2 hours ago) and read 739 times:

Tbar220,
I second L-188's opinion. Chances are, especially if it is an older car, the filter on the electical system has either become disconnected or worn out. They aren't too expensive to replace, just make sure you get the correct model for your car.

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Tbar220 From United States of America, joined Feb 2000, 7011 posts, RR: 28
Reply 3, posted (9 years 9 months 3 weeks 5 days 2 hours ago) and read 736 times:

Any idea why this is only a problem with the AM radio and not the FM radio? I dont know a thing about cars, except how to keep them running, and to avoid accidents Laugh out loud

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Mjzair From United States of America, joined Nov 1999, 392 posts, RR: 1
Reply 4, posted (9 years 9 months 3 weeks 5 days 2 hours ago) and read 734 times:

Go to radio shack, and describe the problem.. they sell a filter for that problem...

Ybacpa From United States of America, joined Feb 2001, 1108 posts, RR: 1
Reply 5, posted (9 years 9 months 3 weeks 5 days 2 hours ago) and read 733 times:

Tbar220,
AM is much more susceptible to electronic interference due to the way the sound is encoded on the radio wave, and also due to the frequency ranges used. A very over-generalized explanation:
AM (Amplitude Modulation) alters the height (Amplitude) of the radio wave to transmit sound. Electrical interference can also alter the height of the same wave. FM (Frequency Modulation) alters the spacing between waves (Frequency) to transmit sound. Interference can not change the spacing between waves, and since the height of the wave does not determine the spacing between waves, electrical interferences has substantially less impact on FM waves.

Hope this helps,
yb

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Tbar220 From United States of America, joined Feb 2000, 7011 posts, RR: 28
Reply 6, posted (9 years 9 months 3 weeks 4 days 23 hours ago) and read 726 times:

Thanks guys, now where do I look to check if the wiring is ok?

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Sccutler From United States of America, joined Jan 2000, 5092 posts, RR: 28
Reply 7, posted (9 years 9 months 3 weeks 4 days 21 hours ago) and read 719 times:

Most likely a failed filter capacitor in (or on ) the alternator. You can get a very inexpensive noise suppresor cap at Radio Shack (or any good car stereo store). Installs in minutes.

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