i have an 04 ranger 3.0 if that fuse link blew on mine would it cause my truck to kill the battery in a coupke mins of running while the alternator is giving 13.5-14 volts
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???
Car batteries have 12.3-13.0volts
Alternators output 13.5-14.9 volts
If alternator is not connected to battery, fusible link blown, then system wide voltage would show 12v, battery voltage, so under 13v, engine off or running
This would not effect running engine until battery voltage drop under 10v usually, which would take a few hours in the daytime, with headlights on then not that long, maybe 45min/hour, depends on how old battery is
It is "safe" to fast charge a car battery at 2.0-2.3volts above its current battery voltage, but only for about 10 min max.
Then you need to drop to a maintenance charge, 1.0-1.3volts above current battery voltage.
That's what voltage regulator in the alternator does
Just after starting engine(takes 60-75amps) battery is drained
Voltage regulator will run its voltage above 14volts to fast charge battery in case restart is needed, but that should only last a few minutes, 10min. max or battery fluids can start to evaporate, even sealed batterys.
Then voltage regulator drops to under 14volts, 13.5-13.8v usually, this keeps battery charged but won't "cook it".
Car batteries can fail out of the blue, there are about 50 plates inside a car battery, if any get shorted then battery is self draining.
Shorting can occur from over charging or draining battery too low.
But in general the plates inside start to lose functional area each time they are used normally, i.e. starting the engine, when enough area is lost then not enough AMPs can be stored, so battery can't deliver the 60-75amps needed to start the engine
And you get the "click, click, click" of starter relay opening and closing because there are not enough AMPs to get starter motor turning.
i.e. starter relay closes, start motor is connected to battery, draws 60amps, battery doesn't have 60amps so battery voltage drop below 8volts and relay OPENS, which cuts connection to starter motor and voltage pops back up to 12v and relay closes again, click, click, click, ect......
5-7 years is life expectancy of car batteries, but if they are over charged or drained too low then expected life is less