Sounds as if wrong battery amp or wrong alternator size. if they are correct, then possibly the ecm is bad. this might not be much help to you, thats what i would start with.
SOURCE: hi. I bought a 2003 focus ZTS w/2.3 engine. It was
there is an inline fusible link from battery to the alternator, large like as inan 80 amp fuse..... the problem mostlikely not that its blown but that is corroded...i believe the 03 its along the front of the engine.... trace the large cable up from the alternator and find its location......its in the kinda protected by lots tape or convoluted tube, so you are gonna have to move stuff
First check your battery get a cheap digital volt meter. Free at Harbor freight with a purchase. Fully charged battery 12.6 volts Not 12.5 or 4 or 3. With the volt meter set on DC volts touch the battery and have someone start the car if the meter shows high 13.5 to 14.7 the alternator is ok if it is less replace. If you have a dead short take out every fuse and relay from the black box under hood by the battery. Remember where they go and plug them one at a time until the discharge hits and at least you will know what circuit it is.They also sell about 20 dollars a plastic meter you hold over the positive battery cable to see if the starter is drawing to much power
A battery open-circuit voltage test will show the approximate state-of-charge of a battery. This test can be used if no other battery tester is available.
Before proceeding with this test, completely charge the battery. Refer to Standard Procedures for the proper battery charging procedures.
See the Open-Circuit Voltage Table. This voltage reading will indicate the battery state-of-charge, but will not reveal its cranking capacity. If a battery has an open-circuit voltage reading of 12.4 volts or greater , it may be tested to reveal its cranking capacity. Refer to Standard Procedures for the proper Micro 420 battery test procedures.
s than 13.5 alternator is bad
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