Found in my Passport, probably purchased from the previous owner. With 20 plus years of wrenching, I have seen number of vehicles continue to rust away with a similar system installed. I discovered it 3 days into ownership of my beauty. I was under the dash scoping out the brake controller connector. I looked up to notice large number of fuses above the kick pedal and bracket with light corrosion.That day I removed, cleaned and lubed (dielectric grease) all fuses in that panel. My theory is that this product doesn't work and adds another draw to the battery, without actually preventing rust. The vehicle already pulses electrical charges throughout the chassis as it sleeps. Even my brake controller pulses power for 15 mins before it turns off. It allows current to flow through the wiring and cycle back to the battery. Living in the Ontario the road salt and weather rot away most vehicles. Dodge, Kia, GM, Mazda are the front runners. I use a product called Krown and have never had rust issues. No need for it... thinking I might say goodbye Diamond Kote.