Hello there!
My dad just picked up a '91 where the previous owner ran a toggle switch into the interior and I took at look to help figure out what's going on. It looks like the switch was added to intercept power from the blower motor, so I thought it stood to reason that it was because of a failed blower control module. Next, I lurked forums to confirm whether that's the case. It seems the consensus is that these modules tend to fail such that the blower runs at full power. This blower will run at various speeds as set from the controls, but I'm seeing ~1.6v on the purple wire with the ignition switch in the off position. While I mended the original harness connector and pulled out the rigged wiring, that presence of voltage sounds like a parasitic drain, so we left the motor disconnected for now. Can anyone confirm that there should be 0v at the connector when the car is off? (There's just a lingering doubt in the back of my mind, in case there's some sort of digital logic here that I'm not hip to.) Thanks!
