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> the element gets power.
But what about ground?
> the element is continuous electrically.
Even if only one element is conducting, you will get continuity from one side to the other.
> the element has no visible damage.
The damage does not have to be visible.
You should get an evenly decreasing decreasing voltage along each element as you go from the power side to the ground side. ie halfway across the voltage should be half etc. If the voltage jumps from 12V to 0V at any point that element is broken.
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