[s-cars] Explain 30,31,15,15a,X electric currents

[Tim Leonard]

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I remember seeing long ago an explanation of the current flow of the various lines of power.
30 is always hot
15 is key on power
15a is ? Key on power through a relay?
 X is ?   Through a relay?
31 is ?  Through a relay?
Thanks,
Tim Leonard
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