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Antenna System Test

IMPORTANT: Always zero out the DMM before taking a resistance measurement in order to ensure an accurate reading.
  1. Disconnect the negative battery cable.
  2. Disconnect the antenna lead-in connector from the radio receiver.
  3. Measure the resistance from the negative battery cable to the coax (outer conductor) connector.
  4. The resistance measured should be 0.20 Ω or less.
  5. Test the following when the resistance is greater than 0.20 Ω.
    • Base of the antenna for a poor connection to body ground.
    • The coaxial cable interconnects for a poor connection or corrosion.
    • Test for an open or high resistance from the battery negative cable to the body. Refer to CIRCUIT TESTING and WIRING REPAIRS in WIRING SYSTEMS article.
  6. After finding and correcting the condition, operate the system in order to verify the repair.

Perform the ANTENNA CHECKING PROCEDURES  after confirming the integrity of the antenna ground.

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