A harness does not control voltage, it only allows for greater current capacity where it is needed. Voltage on a vehicle is always going to fluctuate whether you go through the relays and fuses on the OE wiring or the relay and fuses on the harness itself. Automotive electrical systems are by...
You really get what you pay for though, I can't tell you how many people we hear from that tell us how they get screwed over by what we refer to as el cheapo kits on ebay. Some of these kits have as high as 10-15% failure rates right out of the box, and if they are shipping from Hong Kong or...