U Haul clips. Ideal name.
Effective short term only, until proper joint can be applied. Like in a downpour, or too cold for climbing underneath and handling tools. Of all the monumental products from 3M, can't shake that image. I still have the same supply (container died) from decades ago, rarely used them other than test building 12v circuits, cutting out later and doing up properly.
All too common on vehicles pressed into towing use, when virtually no manufacturers build wiring set up to be tapped. Wonder how many roadside fires are caused by them failing to be secure and start arcing. Sparks looking for fuel.