Who makes a GOOD 4-pin installable plug?

mkirsch wrote:
Thanks, but even though that looks like a high quality cable, it introduces 8 additional crimp connections that I could avoid by simply having a quality plug to install on the ends of the new wires.

What failed were the CONNECTIONS, not the plug. Anywhere there was a butt splice in the wire, the wire disintegrated. I used heat shrink sealed butt splices too. The wire was literally GONE for as far back as I peeled the insulation, replaced with a blue powder. I don't know how you could possibly prevent that with "maintenance."

This is why I want to avoid butt splices wherever I can.

Sounds like a wire defect or contamination. I have never had any issue with a butt-splice sealed with heat shrink. I have at least six that are frequently submerged and holding up for over a decade powering a sump pump. At least 12 years for the ones connecting my in-bed 7 pin connector and they are exposed under the truck.