Yes, I have voltage at the switch. There's a ground, 12 volts, and the switch is adding other wires with 12 volts as it steps up the current to the blower. I checked it with a VOM. There are two relays inside the switch, also and at least one activates when I throw current to it. Could the resister pile behind the battery be faulty? A Mercedes mechanic said he has NEVER had one of those go bad. The blower motor runs great with a battery positive put to it using the ground supplied by the wiring. Thanks, Ernie in Louisville