SOURCE: electrical
If you have a volt meter check to see if there is a drain on the battery when the car is off, you can then pull each fuse to see which circuit is causing the draining. Sounds easy, but I have also seen cases where somone left change (a penny) in the cigarette lighter causing a short cirucit.
SOURCE: 1972 Ford F100 Alternator/Voltage Regulator wiring
Here is what you need.
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SOURCE: Battery not keeping charge after alternator changed out..
If you have a voltage regulator than yes this could very well be the problem however I dont think your truck has one. Normally when this thing happens you check the diode in the alternator but you said you replaced the alternator so well assume that is not the problem. Next with the engine off and all electrical acc off. Loosen the positive cable on your battery take the cable off and watch for a spark between the cable and the battery, if there is a spark that means you have juice being drawn from your battery look for a short in your wiring.
SOURCE: replaced the battery and the alternator in 2006 ford taurus
check the alternator fuse and grounding
SOURCE: battery light ford 2003 escape battery died short in main ig.
yes , repair the alternator
Testimonial: "Thank you I am having it replaced along with the Serpentine belt which has 220K miles orig."
You are correct as far as a voltage regulator being located inside the alternator. No there isn't a seperate one for the computer and 2 of the wires going to the alternator go directly to the connector of the PCM. Not sure of you problem but am guessing you are having a charging problem. have you checked the fuse for the charging system ? If not it is in the fuse panel under the hood of the vehicle. In the fuse layout I have provided I have marked the fuse you will want to check. If you have a good fuse, have had the alternator bench tested and it tested out good, there is also 2 fuseable links in the wiring for the alternator. One of thos could be blown. You could have a wiring problem and the computer itself could be faulty but that's not very common.
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Every 7 sec the voltage varie between 12v to 14.5v. As soon it's hit 14,5 drop to 12v.
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