The charging system on your vehicle is computer controlled . Your vehicle is a rolling computer .The instrument cluster has a microprocessor inside , there is also a body computer ( SJB ) smart junction box , Engine computer etc... they all communicate on a serial data network , C.A.N - controller area network . It's hard to know what's wrong when you don't know how it works . There could be codes stored in the computers , these will not always turn on the check engine light .
Ford Smart Charge System Alternator Not Charging
How to Diagnose Controller Area Network CAN
SOURCE: 1998 ford taures altenator problems!
This may be as simple as needing to tighten your battery cables better. I would also check the ground on your alternator this may not be hooked up as well. If you ran your battery off of the old bad alternator for awhile the CCA's in the battery might be bad. The battery can have enough volts for your system but not enough cold cranking amps to get your car to turn over correctly or to keep a charge as well. I would also check spark plug wires, coil pack wires, the end of the spark plugs just to be safe you know. Autozone does free system checks as well so they can pretty much pin point an electrical service problem for you for free.
SOURCE: 1995 ford taurus will not start at times and later starts fine
Sounds like the Fuel Pump, which is located in the Gas Tank, ahead of the rear wheels, basically under the rear door. The gas tank itself is not hard to remove, and you could get a kit available online. It's probably easier to do if you have ramps and back the rear wheels onto those two ramps, you can't do it as easily by just jacking up the car. If you have two hydraulic jacks, that might work as well.
If you buy the part, you want to bring it to a gas station to remove the gas tank, they should be able to do all the work for you in about one hour.
SOURCE: 2006 Ford Foucs battery light. New alernator, good battery
Your fear is probably right. Get it checked before any major overhaul.
SOURCE: I have a 2006 ford focus. The battery light
I have the same problem Screw napa the can't tell the differance at least not in Georgia. They said it was the battery. Anothe machanic said it's not the altornator either could be a wiring or computer problem. I think I 'll try to trade it in
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