Tahoe with AM radio static

I listen to AM talk radio and my 99 Chevy Tahoe has developed heavy static especially on the lower bands aprox from 55 to 84. Sometimes I can't listen
to the radio for the static. It doesn't increase with engine RPM and has gradually gotten worse over the last few months. In some cases the amount of static changes when I turn the lights on but not always. Any Ideas any suggestions would be appreciated.
Thanks
Dennis
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Check to make sure the antenna is tight on the fender and is grounded underneath..there must be no corrosion. Also, on my 93 blazer, there was a connector, between the antenna and the radio , in line type. It was about a foot from the antenna, and was under the fan blower motor. It seemed ok but the center lead was open..I cut it out, and soldered the leads togeher, and the AM radio never sounded so good! No static or ignition noise. Just a hint..Thanks, Andy

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Dennis, Always had similar problems with my Blazers. These things helped: 1. Make sure good ground. The GM connectors are notorious for corrosion 2. Make sure a good hood ground. 3. Make sure antenna mast to fender is good ground connection. IF you haven't figured it out, you need good grounds
4. If you've had the plug wires off and on more than a couple times, they will be suspect. Don't spend money on aftermarket units. You got to pay the price for good AC Delco wires. They're expensive but there is a difference. If someone has pulled the wires more than a couple times, they probably have separated internally.
Paul P

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My 94 has bad AM weak station static, like you describe. It is not ignition, as it does not change with engine speed. I believe it is the alternator, since it changes as the battery recharges after a start. Dan
wrote:

Colorado Springs, CO My advice may be worth what you paid for it.
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I have a 95 Chevy Z71 that has been having terrible AM radio reception. After reading the post where it stated to clean the in line fuse type connector (on the passenger side fender well where the outside antenna connects to the wiring that goes to the radio.) I did and what a difference!!!! It was corroded badly, I cleaned it up shiny again with a brillo pad and used tuner cleaner on the female connector and the male connector and did the same thing at the antenna itself. Took the antenna off and sprayed tuner cleaner inside the female end and the male end also and reinstalled the antenna. Checked radio and I live near Longview, TX and was able to pull in WBAP 820 in Dallas/Ft Worth (150 miles away) and San Antonio (300 + miles away) on 1200 without any problem.........this was just a few minutes ago way before twilight effect helps radio signals as dusk is usually the hardest time to get AM. I have not been able to get those stations in a long while. I still have a bit of noise from the plug wires but those are fixing to get changed anyway. Sure fixed my problem.................MRT

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Reminds me of listening to AM stations in Ill from here in NY on a crystal radio late at night. Only a few Am frequencies were on 'clear channel' frequencies. This is good site to read up on it. http://www.dxing.com/amband.htm
Cheers

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there is a TSB on chevy trucks with auto transmissions that says the RFI (radio frequency interfearance) is caused by a 12 volt dc motor inside the transmission that makes noise on the AM broadcast band. A friend of mine has a 93 suburban, and this guy like myself is an electronics/communications technician (and a ham radio nut). I once found the TSB on my chevy info cd's and sent it to him.....unfortunatly, I've cleared out my email sent stuff from a year ago!!! but if there is interest let me know and I'll look for it again.
wrote:

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well here goes
BUZZING NOISE - AM BAND OF RADIO (INST. FILT. ON PCM/TCM) #44-96-01
REVISION: 04/14/94
THIS BULLETIN IS BEING REVISED TO REMOVE THE LAST SENTENCE OF THE CONDITION AND TO ADD THE NOTE IN THE CORRECTION. ----------------------------------------------------------------------
SUBJECT: BUZZING NOISE IN AM BAND OF RADIO (INSTALL FILTER ON PCM/TCM)
MODELS: 1992-94 CHEVROLET AND GMC TRUCK C/K, S/T TRUCKS AND M/L, G VANS 1992-94 OLDSMOBILE BRAVADA WITH 4L60-E AND 4L80-E TRANSMISSION
CONDITION:
SOME OWNERS MAY COMMENT OF A BUZZING NOISE IN THE LOW END OF THE AM RADIO BAND WITH THE ENGINE RUNNING.
CAUSE:
THE SWITCHING OF THE FORCE MOTOR IN THE ELECTRONIC TRANSMISSION EMITS AN RFI SIGNAL THROUGH THE PCM/TCM. THE AM BAND OF THE RADIO IS RECEIVING THIS INTERFERENCE THROUGH THE ANTENNA.
CORRECTION:
TO DETERMINE IF THIS IS THE CAUSE OF THE OWNER'S COMMENTS, FIRST DUPLICATE THE CONDITION AND THEN DISCONNECT THE ELECTRICAL CONNECTOR AT THE TRANSMISSION (THIS WILL DISABLE THE FORCE MOTOR). IF THE CONDITION IMPROVES, INSTALL AN IN-LINE FILTER (P/N 1224205) TO THE IGNITION LEAD (CKT 439) OF THE PCM/TCM. SOME APPLICATIONS MAY HAVE TWO (439 CKT), IN WHICH CASE, A FILTER WILL BE REQUIRED FOR EACH LEAD.
NOTE: DISCONNECTING THE ELECTRICAL CONNECTOR AT THE TRANSMISSION WILL SET THE TRANSMISSION DIAGNOSTIC CODES. IT WILL BE NECESSARY TO REMOVE THESE CODES AFTER THE CORRECTIVE ACTION HAS BEEN PERFORMED.
IMPORTANT: DISCARD THE INSTRUCTIONS IN THE FILTER PACKAGE. THIS FILTER IS AN IN-LINE FILTER WITH A SINGLE LEAD ON ONE END AND TWO LEADS ON THE OTHER END (ONE LEAD BEING BLACK (GROUND)). INSTALL THIS FILTER AS CLOSE TO THE PCM/TCM CONNECTOR AS POSSIBLE. IT IS IMPORTANT TO INSTALL THE FILTER WITH THE SINGLE LEAD END GOING TOWARD THE PCM/TCM AND THEN TAKE THE BLACK (GROUND) LEAD BACK AND ATTACH IT TO THE CASE OF THE PCM/TCM. IF THIS FILTER IS INSTALLED INCORRECTLY, THE CONDITION WILL BECOME WORSE.
SERVICE PARTS INFORMATION:
P/N DESCRIPTION QUANTITY 1224205 IN-LINE FILTER 1
PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.
WARRANTY INFORMATION:
FOR VEHICLES REPAIRED UNDER WARRANTY, USE:
LABOR OP DESCRIPTION LABOR TIME N6360 WIRING AND/OR CONNECTOR - REPAIR USE PUBLISHED INSTRUMENT PANEL LABOR OPERATION TIME
FIGURES: 0
GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.
COPYRIGHT 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that co uld assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicl e, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION
Copyright General Motors Corporation. All Rights Reserved.
Document ID #
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