AM Radio noise problem.

By sefiroxx
July 3, 2019 in Gen III & Gen IV V8 Engines (LS-Based)

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sefiroxx

Posted July 3, 2019

2004 Sierra 4.8 SLE

Been having a am radio problem that is slowly getting worse. Decided to focus on symptoms a couple of weeks ago to rule out causes

( I have background in electronics and mechanical work and have installed a few radios over the years so figured it was time to solve this)

OEM stock radio with BOSE option

Symptoms
-FM fine
-AM short distance only
- engine noise is coming thru on AM only (low static)
- operating passenger window sends aoad whine through the System rhyme the driver window buzz is faint.
- have installed a couple of accessory USB ports. No change when they are uninstalled (they are wired to the rear cigarette lighter)

Figure there is a common ground between the window and radio. May have to put a power filter in. Anyone else run into this?

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