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Message: <blockquote data-quote="PistolGrip" data-source="post: 1511208" data-attributes="member: 29340">I’ve had my mostly bone stock 1994 Mustang Cobra 5.0 for 20+ years. For the past few years the stock radio has had a distinct buzz that is clearly the engine firing. This only happens when the engine is running. The higher the engine revs, the greater the interference. I,ve been all over in the engine compartment checking for bad grounds, and have found nothing wrong. I recently pulled the radio out and noticed an off-white little box….the size of a small matchbox that has a red wire and black wire going into it and the same colored wires coming out the other side. I don’t know what it does, but wondering if it could be the culprit. To make matters worse - this interference problem comes and goes in no predictable pattern and is NEVER a problem when the engine isn’t running.My other problem is the dash mounted clock has died. It’s getting power The part # is F4MF 15000 AB. Any help on either of these would be appreciated. If I’m slow to reply, please be patient - my computer broke, too! Despite these hurdles, life is still good!Thanks, Mark</blockquote>