Jonathan Goodish writes:


Everything is fine, except that the wing tip strobes can be heard like a
siren in the headsets. The siren sound is also occasionally transmitted
over the radio when we make transmissions, because I have been told to
"check my ELT" after making transmissions. Here are my observations:


Has it always been that that way; or has it be getting worse?

In either case, I'll add another. Clean and check the battery
connections and any/all engine/alternator ground straps. BOTH ENDS.
You typically have a ground lug that's connecting to a dissimilar
metal; that's corrosion city.

Why does it matter? Well, the battery is [also] a whopping big
capacitor; you want low impedence connections to it.

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