Quote Originally Posted by 34_40 View Post
With black electrical tape, if you tug the tape to break it and "finish" the connection, it will in time unravel. The memory in the plastic will pull the end back.

To do the job right, cut the tape with a razor ( or scissors ) to finish or end the connection.

Over time with the drastic changes in temperature black electricians tape will unravel no matter what it's cut with. A plastic wire tie will insure that that will not happen. In the last 40 or 50 years I've never had one unravel and I sure wouldn't want a 12 gauge wire to become exposed under the dash. Doing the job right is not nearly important as how safe it is.