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Static noise from the radio from power windows. 700 1991

posted by euroboyLA on Fri May 23 07:45 CST 2003
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Hi, all!

I bought a 1991 740 SE Turbo Wagon a few days ago (I love this car!)
Had to leave the radio on for my daily drive in order to reset it to "cod e" mode (someone tried wrong code and it was showing "EEE").

I believe the radio is currently in AM mode (as in AM/FM)

I noticed a few types of static coming from (mainly) the rear right speaker:
- When driving: static from rear right speaker which changes with engine rpm (interference from spark plugs?) and when
- when operating right power windows -- very loud static (as if the electric motor's operation is being put through the speaker). Left windows: no or almost no noise.
- when the engine is off, key still in, I am not touching any controls: strange, "in between stations" noise which dies if I open the door or turn the dome light on (radio is still on)

Both noises are not affected by the volume control (I presume because radio is locked).

I will retrieve my code from a dealer today, but the noise is really bothering me. I am considering changing the stock casette stereo with a cd/mp3 player (Blaupunkt mp3000 was recommended to me by a friend, $125 on ebay) but am concerned that the noise will remain.

Any suggestions / experience?

If I come to a solution, I will make sure to share it here.
Thank you in advance!

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Static noise from the radio from power windows. 700 1991

posted by Aye Roll on Fri May 23 08:47 CST 2003
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last visit: Tue Oct 14 21:08 CST 2014

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All radios are subject to interference on AM bands. The best you can do is minimize it. Try adding a noise suppression capacitor at the coil terminals. Add an inline suppressor or "choke" in the power leads to the radio (green wire probably). MAke certain all radio ground wires are connected- perhaps add another to the screw on the back of the case.
Also, capacitors can be added to other noisy equipment, such as the alternator output terminal, the windshield wiper motor, or even the electric fan. Normal connection is from + terminal of the device to a chassis ground. The condensors sold for cars with points ignition systems work really well, though they do have short leads. I've used the ones from VW aircooled distributors with some success.

The alternative is to use FM... noise is the reason they invented it!
--
Rob Bareiss, New London CT ::: '87 244DL/M46- 220K, 87 244DL- 230K, 88 744GLE- 198K, 91 244 180K, 88 244GL 145K

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