What is loose wire?

What an ignorant person or dealership tech says the problem is when he or she does not have the mental capacity to properly diagnose an electrical problem in a vehicle. This conclusion is typically drawn after a tech plugs in a scan tool that does not tell him what the problem is and has no clue how to troubleshoot further.

I cannot figure out why your car won't start, must be a loose wire.

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loose wire - video