Question about 2003 Ford Focus
Last year I had my alternator replaced. My battery light came on soon after and has been on ever since. A mechanic shop told me that the battery overcharges to 15.2 when is should be between 13.5 and 14.2. I need to get my car inspected next month and don't know what to do?
Never saw a charging system problem cause anyone to fail inspection. But, overcharging will cook the water out of your battery and can damage the computer system if not taken care of. Overcharge can be caused by either a grounded alternator field wire or a bad regulator. Since the condition appeared after replacing the alternator it too is suspect as an internal grounding can also cause that.
Posted on Jul 20, 2009
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Posted on Jan 02, 2017
Most likely it is the voltage regulator that's going bad which allows overcharging. this is inside the alternator, so it most likely needs replacement. you could pull it out and take it in to most auto parts stores and they would check it to make sure.
Posted on Jul 06, 2009
SOURCE: alternator overcharging
ok, there is an earth wire between the engine and the body (usually bolted to the exhaust manifold), you need to undo it from the body, and with a piece of sandpaper or a file, you need to clear away the paint from under where the wire connects to the body, (might be a bad earth giving a faulty sensor reading, because on the production line the body is painted before anything else is fitted), clean the end of the earth wire contact and re-connect.
if you still have the same problem, you need to see an auto electrician or your nearest dealer.
Posted on Dec 03, 2008
Look for loose or dirty connections. Could be a poor ground connection or could be poor connections at the battery. Clean the battery terminal connections.
Posted on Sep 08, 2010
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