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#1 |
Registered User
Join Date: Jan 2005
Location: Azle, Texas USA
Posts: 48
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Help Radio noise
Has anyone ever experienced a noise through the radio that seems to be coming from the altenator? The more things drawing power the louder it is. The noise is a high pitched whine.
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#2 |
Senior Member
Join Date: May 2004
Location: Seaside, Oregon
Posts: 1,789
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If it's RPM related, you should be able to buy a noise filter for that.
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-Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4 |
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#3 |
Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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That reminds me of a funny story..... Once I had some odd radio noise and I thought the same thing, installed a filter and it was still there. Rewired the power but it didnt help. About a year later I replaced the antenna because the old one looked like crap and the entire wire had filled up with WATER! It had leaked in where the wire connects to the antenna and rusted up the inside. It made a nasty looking puddle on the garage floor. Put in a new antenna and wire and it worked like a champ!
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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#4 |
Registered User
![]() Join Date: Aug 2001
Location: Rocky Mount, MO
Posts: 1,293
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Go to Radio Shack and get a noise suppression coil. Hook it to the positive wire to your radio. No Noise.
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#5 |
Senior Member
Join Date: Feb 2005
Location: Maynardville, Tn
Posts: 3,030
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Your might also have your alternator checked for a bad diode bridge.
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#6 |
Registered User
Join Date: Jan 2005
Location: Azle, Texas USA
Posts: 48
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Thanks guys I will try both.
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#7 |
Registered User
Join Date: Dec 2003
Location: here
Posts: 5,789
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Check for a "ground loop" before you buy anything. Make sure the antenna is grounded (at the cowl) good & the radio ground wire too. If your radio or your antenna dont have a good connection you will get a loop & get all sorts of noise. Is the radio a good brand or a cheapie? With some of the cheapies you will never get rid of it...corn
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#8 |
Member since 2000
Join Date: Dec 2000
Location: Mountain View Ca / Mexico
Posts: 7,879
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are you running a amp?
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#9 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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also dont forget crappy ignition wires or solid core ignition wires will cause radio noise as well
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#10 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,772
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At first I thougt you were going to say you were listening to rap music.
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
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#11 |
Registered User
Join Date: Jan 2005
Location: Azle, Texas USA
Posts: 48
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I'm not running an amp now, the radio is an older Kenwood. I don't listen to rap, but the ground idea is interesting. I hope to get a little Blazer time this weekend!
Thanks, Al |
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#12 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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I say you have an electricly 'dirty ground'. try moving the radio ground wire to another location.
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#13 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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If the noise becomes higher pitched when you increase your RPM's, it's typically "alternator whine". This is especially common in late-model imports and it most often due to poor or improper grounding of your stereo components
Alternator whine is caused by several things. The most common I typically ran into at the stereo shop I was working at were: - When speaker wires or RCA lines cross power wires or other power equipment - Ground loops, especially if your stereo is not grounded to the same place as your amp) - Poor grounding ** (this is the most common cause) - Insufficient power, or tapping power from an over-used power source Any of these suggestions might help: Start by checking yoru grounding. Try to keep your ground wires as short as possible and make sure you adequately scrape paint to obtain a good ground. If possible, be sure to ground to the frame; a thing strip of metal isn't going to provide adequate ground. Cheap speaker wires (18-24 gauge or smaller) is much more susceptible to EMI interference. The smaller and finer the wire is and/or the poorer and thinner the wire casing is, the more chance for noise and interference. Look at Radio Shack for a 'ground loop isolator" or find one online. There are some noise filters that can be purchased at Radio Shack and other places to help isolate your power line. Never run any speaker or RCA wires parallel to power lines. If you must, keep them running together as short as possible If you use a remote turn-on wire or power antenna wire, it can pick up interference to cause alternator whine. |
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