I have a 2007 ford fusion SEL 3.0L V6 with 100 thousand miles on it but in really great shape. I got a check charging system warning on the screen, but no light on the dash. I noticed it was a little weaker at starting, but not extremely weak. I checked the battery with the multimeter and got a 12.86 volt reading while off, and a 12.33 volt reading while running and max electrical activity, which I dont think is really that low for my alternator‘s size. Now I just tried to start it and it was practically dead, I heard one successful revolution and then everything shut off: radiator fan, dash lights, headlights, everything. After a few more tries it finally turned over, and now starts like it did before (slightly weak). Any other auto people have advice? By the way when I couldnt get it to start i did use the multimeter again and it still had a 12 v reading. is there another way i can check the alternator?
This happened to me in a 2006 Ford Fusion. Turned on the key, read out says check charging system. Turns over slow.but just wont start. Found out there is a fuel reset switch that can be tripped. Mine must have when I took out the battery, not sure. Anyway, There is a button behind the passenger side kick panel. If you lay on the floor board and reach over the top of the panel (toward the outside of car) you can feel a ring with a button inside it. What I did was to push it and hold for a couple seconds with the key off, then did it again with the key to on. Turned the ignition off, then tried to start it and it fired right up. Smelled of over fueling due to my heavy foot when it wouldn't start. It eventually evened out and is running fine. Hope this helps. Rhino
No matter the size of your alternator, you need 14v while the engine is running. Also, have someone crank the engine while you have the volt meter on the battery. If it drops under 10v,replace the battery too
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I agree with RWO, your battery readings are too low when the engine is running. The alternator should be putting out somewhere in the vicinity of 13.5 to 14+ right after a start if its operating as intended. I'd check the alternator at an auto parts store, most will do it for free, because the symptoms you describe are classic for a bad alternator that is not putting out enough to charge the battery much less run the electrical system.
