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Old 05-23-2014, 12:21 PM   #1
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Alternator/Blower motor

Im dealing with a 2007 Ford Focus 2.0L SE. My wife came home last night complaining that her headlights were dimming and that she felt a loss of power on the highway (only once). Shortly after I took the car for a dive to verify the complaint, I was able to see that the headlights did dim however I could not replicate the loss of power.

My first thought was this is a charging system issue. I tested the battery for voltage with a voltmeter and got the following result 12.68 Volts (normal) (pic below)

I started the engine without any electrical load and held the RPMs around 1500 with a result of 14.26 Volts

Then I turned everything on (A/C, lights, brights, fan, rear and front wipers, ect...) The Voltage dropped very steadily to below the original battery voltage. (Pic at 12.9 Volts it dropped down to 12.4 before i shut it off)

Okay.... So I replaced the alternator and battery last summer so I was very skeptical that it was out again.

Also about five months ago Her blower motor went out. I bought a new one from auto zone that didn't fit as it was the wrong electrical port config. I figured at that point oh well i'll just pay a little extra and buy one from the dealership. I put the old one back in and it work all the sudden. I didn't question it and just put everything back together and figured i would replace once it really failed.

So b/c of this I unplugged the blower motor and then turned all the electrical systems back on including the a/c and fan speed. I got a normal volt reading 14.9 Volts.

I don't have the greatest understanding of the electrical/charging system. Am I doing something wrong here? What am I suppose to make of this? The blower motor is drawling to much voltage yes? Do I just need a new alternator again? Thanks in advance for anything guys! (sorry the pics are so big =/)

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Old 05-23-2014, 02:19 PM   #2
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Run the car over to Autozone and have them do a charging system test. It seems that you have a diode out in the alternator.
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