okay I want to do something real quick this is for one of you guys out there in cyberspace had a question on a 2002 Chrysler Sebring with a blower motor issue and I want to do it this way because I think it will be beneficial for everybody so let me do this quick try to explain how this system works and where there can be some confusion when you're testing this kind of assert first thing is here's your blower motor in the picture and this dark green wire is hot in the run position so what that means is this blower motor has power all the time and then all of our controls are going to be on the ground side of the circuit so this is ground side control we could call this and you see our resistor is here and our blower switch is here our main ground point for the blower switches right there and so what this switch is going to do in each position is it's going to ground a different leg of this blower resistor which is over here so if you were tucking this circuit but just talked about what you would see in a normal working circuit if this switch is in the off position what you're going to see if you were doing your checks at the blower switch itself is each of these wires the high the medium high a medium low and the low position every single one of these I will show you 12 volts and the reason behind that is you have power that's coming through the blower motor itself and it's looking for a ground and there isn't one yet so this is going to follow this way so you have 12 volts on that wire we're going to go through a resistor and it's going to go this way and you're going to have 12 volts on that wire and what some of you are thinking already is won't that resistor cause a drop and the answer is no because there's no current flow no current flow no voltage drop all the next one it's going to go through this resistor and again we're going to read 12 volts there and it's going to travel through the last resistor and we're going to have 12 volts here ignore this splice right here for the high position that is an input to the computer that's not relevant to what we're doing here that's just an input circuit does not affect the controls here whatsoever so that would be the first thing is you're going to see 12 at each of these positions if I switch this we'll start in the high position first if I switch this to the high position what we've done is we've provided this blower motor with a ground that does not have to go through the resistors at all and so it will come this way and it will get what we could say pulled to ground or ground side switch would be a better term that this blower motor now has a full ground so how much voltage is left at the at the end of this resistor which is the only one in the circuit it's zero there may be a few hundred millivolts because of resistance in the circuit but it's a full ground this is a full ground at this point and so what that means if if you were to measure any of these other legs there all right now going to be zeros so in the high position what you're going to see on all four wires is zero now in the whole line again this high position you may have a few hundred millivolts because of resistance and switch resistance in the ground resistance in the wiring a few hundred millivolts will be okay that'd be the high position the medium high this blower to get its ground has to travel through one resistor before it can make it to that ground point of course there is a path here too I'm going to draw this a different color there's a path here too but the switch isn't connected to the high position so there really isn't a path so voltage wise what you will see would be some number I can't give it to you because I don't know what the resistance values are but you're going to have some number in the high position that would be less than battery voltages are less than 12 volts and the reason at that point if you were measuring there think about where you're measuring this would be the equivalent of you putting a voltmeter right here so you have one resistor that's upstream of that voltmeter which is the blower motor and another resistor that's after it you're basically reading the voltage drop across that motor at that point so let's call this less than 12 and then at this point my medium to or medium high wire this light blue I've colored red this is going to be your wire that reads zero and the next two are going to be zero that's what that would look like again we're measuring on the high position wire this green wire I have drawn here you're measuring basically like this you're going to have a partial drop across the motor and the remainder of the drop across this resistor and that is why you would read at this point which would be this point right here less than 12 volts some type of drawing let's continue medium low now we pick that position this will be 0 this will be 0 the bottom - same thing is going to happen we're going to have at this high position is pin 10 it's going to be again less than 112 volts and this is going to be even lower than that it's going to step down even lower let's say for example this one reads 10 volts maybe at this point this one might read 7 volts here's why blower motor to get a ground now has to go through one two resistors this light green wire is my switch position and so these other two pins these other two contacts and you don't really have to measure it that way but you just need to understand that this black with a tan which is the high position and this light blue wire are giving you access over here to different points in the resistor bank so it would be the equivalent of you taking a voltmeter at this point to ground on taking a voltage reading here and at this point to ground taking a voltage reading here and what you have going on is you have current flow across or voltage drop across the motor another voltage drop that occurs across the first resistor and another voltage job that occurs across the second resistor you add these three up together these voltage drops and that will equal your source so you're seeing voltage drop along the way so that hopefully explains what I'm talking about that at this pin and this pin you'll have numbers that will correspondingly drop as you go so maybe this one is 10 and this one 7 and now we got 0 because that's my true ground this one 0 because it's after all of this we're getting our ground here so this last circuit there's no voltage left final one would be my lo position in the low position you see that my ground is now going to be this circuit so that blower to get a ground it has to travel through one two and three resistors and once again if you're monitoring at the switch with these other circuits me low medium high at high you're going to have wiring that is attached to different points in the resistor it's like you're taking a voltage measurement here a voltage measurement here at a voltage measurement here so it might look something like ten seven four and then what what are you going to have on the last wire is zero now those numbers I'm going to be wrong on these numbers as far as exactly the numbers they are because I don't know what the resistor values are I would need to know that and then I would need to know the blower motor resistance itself and that's really hard to judge because a running motor has more resistance than a stationary motor so even measuring the resistance of the motor isn't going to help us here but hopefully that makes sense on why you're going to see those different voltage readings I don't know if it's going to be helpful to plug in some problems here because there's so many different variables we can have I think we'll just leave it at that that that's the operation of this circuit and we'll see the result and hopefully this helps this gentleman and hopefully it's good for the rest of you guys