Yesterday I was replacing lamps on a job that was done by a contractor 7 years ago. The sytem was mostly Unique well lights and transformer. The wire at the Hub connection and at the transformer was totally black. The Hub had a non-copper connector without any dielectric corrosion preventing grease or silicon etc. and not the typical barrel lug and Oxgard grease used in a Unique Hub. The connector was disintegrating and one of the them was hot to the touch while under power. I have seen many other lighting systems with excessive corrosion in the past with adequate voltage to the lights and seemingly functioning well. However, eventually these non protected systems must fail. I've got my guesses but I'm looking to have them validated. Has anyone actually seen a failure from long term exposure to the elements without corrosion protection and what does this failure actually look like and what, if anything short of changing out the wire, can be done at late stages of corrosion to extend the life of the system? Jim C.