And along the lines of isolating, I wonder if a portable AM radio would
show the same issue?

My first thought was that the issue is ground related. i.e. is issue due to
RF or some kind of interference "transmitted" through the Vanagon
wiring/frame to the radio?

Neil.

On Fri, Mar 16, 2018 at 10:18 AM, Mark McCulley <mark.mcculley@gmail.com>
wrote:

Can you remove the brake light bulbs and test to see if you can isolate to
> the regular brake lights or the high-mount brake light?
>
>

--
Neil n

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