You could run new wires, and might have too.
I would run a continuity check on both wires to ground and to pin18(IIRC)
For instance, If you tried for whatever reason add a gauge to the signal wire it will cause this issue. I've seen it a billion times, it's really the added resistance on the signal wire, that's why i suggest a continuity test. In you situation it seem intermittent, so it might be a short.
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