Anytime you have a bare electrical hot lead, it is a possible problem. You MUST cover it up. Tape works for a short time, but can deteriorate quickly. Heat shrink or friction tape is better. A vacuum line split and installed over the wire also works, if taped or sealed. You can also coat it with a bit of silicone gasket sealer, or a liquid rubber.
No matter what you do, clean it with some brake parts cleaner first. This leaves no residue, and the adhesive will stick better and longer.
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