You can't LOOK at a battery cable and tell if it's good.
What you need to do is actually take the connections loose and clean them thoroughly with an abrasive tool.
The lights should always work whether the key is on or off. They're hooked up to a separate circuit. Since they don't work, I would have to say that you have no power from the battery whatsoever. That indicates a bad ground or broken cable.
A multimeter to test the battery voltage, as well as the continuity of each battery cable is the next step after cleaning.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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