AM RADIO CRACKLING

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Warren Wilson
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AM RADIO CRACKLING

Post by Warren Wilson » Fri 17 Jun, 2011 12:29 am

A loud crackling sound from the speakers when the engine is running and the radio is on the AM band. The cracking 'tempo' increases when the engine revs increase. Sounds like some type of ignition problem. CD player and FM unaffected - only the AM radio band. Perhaps a trip to an auto elecrtician is easiest, however I never do things the easy way. Appreciate any comments.
Thanks in anticipation
Warren Wilson
1999 E240
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Warren
2008 W204 C280 Avantgarde
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AMG
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Re: AM RADIO CRACKLING

Post by AMG » Fri 17 Jun, 2011 12:47 am

sounds like you have a ground loop. changing /adding the suppression capacitor on your alternator and isolating any ground loops should resolve your issue. check any rca cables running near power are isolated.

best place to start is by cleaning all the earth connections from your radio, battery, alternator, starter, main engine earth strap etc. making sure they are secure and clean. make sure all the earth connections to the radio ground at the same point. swap the alternators suppression capacitor for a new one. after that you get into the wiring harness and look for ground loops created by non-factory wiring.
Current:
1987 560SL 4sp. auto Signalrot "Stella"
1987 190E 2.3-16 5sp. man. Blauschwarz "Hermann"
1992 300CE-24 6sp. man. Perlblau / Iceblau "Gretel"
1992 Range Rover Vogue SE 4sp auto Ardenne Green "Oswald"
2012 Renault Sport Megane RS265 Trophy 8:08 6 sp. man. Liquid Yellow "Jean Rédélé"
Previous:
1986 560SEL Anthracitgrau "Schultz" - In Mercedes Heaven
1987 190E 2.6 4sp. auto Signalrot "Sabine" - which now resides/owns Andrew M's Garage
1972 350SLC Astralsilber "Lurch" - now in the loving care of Craig B
1989 2.5-16 Blauschwarz 4sp. auto (parted) formerly owned by Derek/Hasan.

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Warren Wilson
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Re: AM RADIO CRACKLING

Post by Warren Wilson » Fri 17 Jun, 2011 4:03 pm

JoeB

Thank you for your comments - much appreciated.

Warren Wilson
Warren
2008 W204 C280 Avantgarde
http://www.imageupphotography.com
FaceBook: This Fascinating World
I'm so proud of my Benz, I would refuse a jump start from anything other than another Benz.

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Tony From West Oz
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Re: AM RADIO CRACKLING

Post by Tony From West Oz » Fri 17 Jun, 2011 10:22 pm

This can also be caused by low RF level to the receiver, so also check the antenna (does it go all the way up?) and antenna cable to the radio.

Is this present when in the city or only in remote areas?

Regards,
Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (occasional tourer)
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