Question about 2000 Ford Focus

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I have a 2000 Ford Focus. One week ago the battery light came on and stayed on for two days when the voltage drained and left me stranded on the side of the road. I took the alternator to a rebuild shop where they replaced the regulator.I reinstalled the alternator and it seems to be charging and it cranks easily but when I use the power windows or listen to the radio somewhat loud they will dim the headlights and instrument lights. The battery light still comes on after starting and stays on.

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Sounds like the alternator is still not making the correct voltage to charge the fully. The battery light comes on when the alternator doesn't make enough voltage to charge it. Your alternator might still be charging, but not putting out required voltage. I would have your alternator & battery tested. Hope this helps you.

Posted on May 27, 2011

Testimonial: "Thank you! I had a feeling there was still an alternator problem. Taking car by alternator shop 2morrow and have them check it."

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Check battery: after a car is started the car runs off the alternator but the battery is still part of the circuit. Does any juice drain while the car is off? If yes then something is constantly pulling power but is only noticeable when running accessories. If no then it's most likely in the ignition circuit. Multiple connections could be touching. I recently replaced an ignition control module that was going bad. It was pulling power while the engine was running and draining the battery when it was off. The point is a bad electrical device can cause this problem. Whatever the problem it needs to be hooked to a diagnostic machine or troubleshooted by a mechanic to pinpoint the problem. Hopefully this gives you a place to start.

Posted on May 27, 2011


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