Bought for an 85 Grand Wagoneer 5.9L. Installation was easy and I tried using it as a single wire. Is free. I increased the speed, checked the grounding, but still does not charge. Thanks to Revain's return and reorder, I was able to get a replacement within two days. Reinstalled and this time I have 14.7-14.8 over idle. hope it lasts Update 03/09/2020 Six months later and a total of around 500 miles driven on a truck with less than 200 hp. Alternator bearing creaks today when starting after changing the battery. Generator voltage jumps quickly from 10 to 12. Second generator in 6 months. I had to buy one locally at the parts store so I had at least a warranty.