In article ,
Jack Erbes wrote:

Are there any ferrite loops on any of the wiring involved? Like on the
output leads from the charger, the power leads to the radio, and the
speaker leads on the radio?

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Jack Erbes in Ellsworth, Maine, USA - jacker at midmaine dot com

Better to stop the RFI at the source, than trying to keep it out of the
radio. Install a "Quality" alternator noise filter as close to the
alternator as possible. Numar makes some good ones. Install noise
filters on all your DC motors. ( Refer, domestic water pump, ect)
Ferrite Filters are nice for filtering poorly designed Marine Electronics
devices, but they just don't have the capabilities for filtering MAJOR
noise sources.

Bruce in alaska
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add a 2 before @