Originally Posted by
XxfirexX
Update
My remaining drain kills the battery in about a day. When the car is off I still have 1.8v going to the blower motor resistor plug middle pin\wire. I think it's going to come down to the AC Heater control being bad but there still have to be something that provides that 1.8v to run the blower …..
There are three pins on that socket that goes to the blower resistor, #1 and #3 provide a constant 12+volts, the black or brown wire provides the earth.
The centre pin socket #2 and the earth socket provide a variable voltage to control the fans speed. If you are getting 12+volts constant from both sockets and earth it is the AC/Heat control on the dash causing the problem.
I purchased a cheap regulator/resistor and it was DOA. I replaced it with a Behr.
I imagine that the power is switched off automatically only when the circuits are working as they should otherwise they are just bypassed. There must be some sensor that measures the battery power but I do not know where it is.