Ranger 2WD V6-177 2.9L (1989)
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Note the reception performance of a known good vehicle in the desired locations. Note the presence of any local external noise sources (eg. power
lines, etc.).
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Compare the performance of the concern vehicle when receiving the test stations in the same locations.
DIAGNOSIS
If a vehicle's audio system has been verified to have an AM fading or static concern that is not found in a comparably equipped vehicle under similar
conditions, perform the following diagnosis.
VISUAL INSPECTION
Poor AM radio reception may be caused by poor antenna cable connections at the various antenna cable connectors, and/or at the antenna base. Visually
inspect all the connectors of the antenna system. This includes...
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The antenna connector at the rear of the radio
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The in-line antenna connector (if equipped)
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The connector at the base of the antenna
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The base of the antenna for signs of poor grounding (Some antenna bases "bite" into the underside of the fender for grounding. To ensure proper
installation, refer to the appropriate Service Manual, Sections 35-10 or 15-02, depending on model year.)
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The antenna for any loose screws or station nuts
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Improper connections (repair if found and verify the effectiveness of repair).
CORROSION INSPECTION
Inspect all of the connectors of the antenna system. These include...
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Connector at the rear of the radio
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The in-line antenna connector (if equipped)
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The connector at the base of the antenna
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If there are signs of corrosion (severe discoloration, rust or white powder from the zinc die-cast bases) on any antenna components, repair the
concern by replacing any antenna component where evidence of corrosion is found. Verify effectiveness of repair.
ELECTRICAL TESTS
Perform the following antenna conductivity/resistance diagnosis and testing procedures.
ANTENNA TEST # 1 - ALL ANTENNA TYPES
