I've replaced my fan switch, resistor, and relay on my truck. The fan is only getting 7 volts. The fan works fine on straight wire. I want it all to work originally since I've worked so hard on it. Seen on a old forum where it was a ground issue. Haven't tried it yet but, I've had to replace everything in the dash because of incompetence and winter is coming soon. Really need heat! Any help would be appreciated.