Quote:
Originally Posted by someday31
Yeah what I meant was higher amp output the volts should be the same. Im saying that my alternator should put out more amps at idle than stock, especially with my battery not being fully charged due to the problem.
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the battery can only take in a set amount of current ...when the battery is cold the battery will absorb less current , a hot battery will absorb more current...that also applies to the battery suppling current..so when a battery is cold you do not get the maximum battery output...this is why in the cold areas most get the larger sized batteries...like the 875 CCA / 1000 amp cap at optimum temp...
if you had a 400amp alternator the most the discharged battery could take in would be about 40amps...on a charge...with the 14.75 volts..
now if you placed a 37 volt dc 200amp charger on it you could ram in 100amps into it , but the battery would soon be boiling ....
whenever the battery is low on a charge the current supplied is limited to about 10amps...this is to protect the battery plates from damage...this is why these alternators are designed as you have thoughly tested and found out..
my 105 amp alternator puts out 66amps with every thing on .when hot ..at the 13.75 volts ..this is the same as your system..this test was done when the vehicle was new in 2000...I have in 10 yrs , only installed one battery..the reason I replaced the OEM battery , was because it was 7yrs old...
If you have no parasitic loads draining the battery , then the only other reason would be a 1000watt sound system is drawing more current than the alternator can supply...or some other device like a large inverter power supply ...these items can draw 50-80 amps ..