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There's very little you can determine about coax with only a multimeter.

Start the engine and turn the radio on. When you have the noise, disconnect the coax connector at the back of the radio. Does the noise go away? Plug the coax back in and tighten the connector. Does the noise come back (if it went away)?

Noise can get into your radio either through the antenna or through the power leads. There are different fixes, depending on just how the noise is getting in.

[QUOTE="Beetle, post: 539427, member: 1066"] There's very little you can determine about coax with only a multimeter. Start the engine and turn the radio on. When you have the noise, disconnect the coax connector at the back of the radio. Does the noise go away? Plug the coax back in and tighten the connector. Does the noise come back (if it went away)? Noise can get into your radio either through the antenna or through the power leads. There are different fixes, depending on just how the noise is getting in. [/QUOTE]

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