Question about 1993 Toyota Corolla

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Car radio interference on AM

I had some welding done on the car round the A pillar. This destroyed the antenna cable. It also caused a major electrical failure but that was fixed for free. I don't know what work was done.I have repaired and then replaced the antenna. I have also replaced the radio.

The radio works perfectly on FM at all times, and on AM with the ignition off. I think its predecessor did too!

I get whistles, of varying pitch, and other garbage when the ignition is on. The engine need not be running to experience this, so I guess the charging circuit is innocent. The car runs perfectly in every other respect.

I assume this is to do with the ignition, which I assume has some electonic component, but it doesn';t appear to have any effect on its starting or performance.

Running temporary exclusive power from the battery does not fix the problem

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  • nickindy Mar 02, 2009

    Thank you both for your comments, particularly about the extra ground wiring. The problem is with me when the ignition is on but engine is not running. I therefore don't think it can be the alternator or the HT wires. Running the engine does not make the situation worse. I am suss about the ignition. I will try and disconnect the two plugs by the distributor. It is difficult to get the big one apart.



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Well you have done well by replacing the antenna and then the radio. Hmm. Here are some possibilities.

Make sure that the ground wire on the new antenna under the body that the antenna connects to is solid. Make sure that you replace any antenna extensions and that they are plugged in solid.
you should check for good solid engine grounds on the motor to the body. If you do not see a good one, then add one.

You may want to install new spark plug wires that are noise suppression. Be careful with handling them they are delicate.

Add a noise suppression kit, which is a bandaid at any car stereo store. Make sure the radio is grounded at the radio with a strap and that the negative is connected to the chassis.


Posted on Mar 02, 2009

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If the radio still does this with the alternator unhooked, I would try changing the plug wires.

Posted on Mar 02, 2009


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