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Old 01-04-2005, 04:54 PM   #1
dingo dave
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Default Would grounding mod cease static in AM reception?

It's wierd, sometimes my AM reception is filled with static, sometimes it's fine. Also, the higher i turn the AC on the worse the static gets. Would a grounding kit solve this issue?
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Old 01-04-2005, 07:35 PM   #2
Legacy777
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It might improve things, but it's hard to say for sure.

Does it do it on all AM stations or only certain stations? Maybe the one you listen to most has signal issues. Next time it does it, take note of the weather.
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Old 01-04-2005, 08:28 PM   #3
Caliber
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Well with the a/c switch your changing (reduce) the resistence to ground, to increase the blower speed.

A grounding mod might help a little, but only trying it will give you the anwser.
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Old 01-05-2005, 10:35 AM   #4
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an inductive/capacitve noise filter in the power lead to the radio would probably be much more efficient at keeping hash from the radio power supply (and ultimately the speakers). you can get 'em at radioshack, etc.

jm2c
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Old 01-05-2005, 11:02 AM   #5
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Noise pickup on AM is usually radiated RF pickup through the antenna rather than from the power, if it's power you'll get it through the HU in all modes (AM, FM, CD).
If the noise is changing with the blower speed (does it go away with the blower off?) the source is the blower motor itself, in this case a bypass capacitor across the motor leads might help.
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Old 01-05-2005, 04:57 PM   #6
dingo dave
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It goes away if the AC is turned off. Gets worse as the blower is turned up.

It does it on all AM stations.
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Old 01-05-2005, 05:17 PM   #7
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So the blower motor is definitely the source. A small capacitor (value .1uF or so) connected across the wires that go to the blower motor should reduce or eliminate it. The cap should be as close to the blower as possible.
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Old 01-23-2011, 09:40 PM   #8
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I had a similar problem with my WRX. What I found was that the antenna connection for the radio wasn't made up well.....I unplugged it/plugged it back in a number of times, and since then, no static.
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Old 01-23-2011, 10:25 PM   #9
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If the blower motor is failing (brushes wearing out, etc) it can cause the RFI you describe, otherwise it can be a faulty connection at the blower motor wire harness or blower motor resistor pack. Check the wiring harnesses for corroded terminals, etc.

Does your blower sound noisier than normal, or make weird noises when running?
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Old 01-23-2011, 11:15 PM   #10
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Quote:
Originally Posted by jdefils View Post
I had a similar problem with my WRX. What I found was that the antenna connection for the radio wasn't made up well.....I unplugged it/plugged it back in a number of times, and since then, no static.
i had the same thing......
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Old 01-24-2011, 08:45 PM   #11
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AM static problems were fixed in the 1970's... its called FM. Then they fixed it yet again a few years ago... its called CD/Sat radio/ipod etc.
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Old 01-25-2011, 07:28 PM   #12
TXwrxWagon
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check radio antenna conection & also check that the radio to chassis ground wire is clean & solid.

a/c issue is unrelated... but as mentioned if the motor is failing it will emit RF static.

Rob
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