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Date:         Fri, 16 Mar 2018 09:25:39 -0700
Reply-To:     stuartmacm@GMAIL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Stuart MacMillan <stuartmacm@GMAIL.COM>
Subject:      Thought problem for Friday
Content-Type: text/plain; charset="us-ascii"

Figure this one out:

When I depress the brake pedal I hear a faint high pitched "whine" from the radio. It's pitch (frequency) changes with pedal pressure (higher with more pressure), and only happens on AM stations. Unfortunately, my favorite sports radio stations are AM so I hear it often.

It didn't change with a new radio last year, and I do have LED brake lights and the GW high mounted LED brake light. Brake light switches have not been replaced. Whine was there with the 1.9 engine and is unchanged with my '93 Subaru 2.2 engine conversion. I have not switched the bulbs back yet, but I'll give that a try and see if it goes away.

It's just a nuisance, but I'm stumped, particularly by the change in frequency with pedal pressure. Any ideas why LED brake lights might cause this? Maybe install a capacitor on the radio like this? https://www.amazon.com/PAC-CSS12-Passive-Filter-Capacitor/dp/B000CEDZBA

Stuart

'85 Westy


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