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First, you state "the battery is only getting 11.58". This implies the alternator IS charging albeit too low. I would connect the voltmeter to the main terminal on the alternator and take a reading before starting the motor, then again with the motor running at around 1500 RPM (fast idle). This will indicate whether the alternator is working or not.
Getting back to the ign light, does it remain at the same brilliance before starting the engine and after?
If the alternators are not exactly the same as the original then there may be a problem with the voltage regulator circuit. Some alternators have internal regulators and others have external regulators.. Check for fuses in the charge circuit . If the battery is faulty then the alternators will not charge any way. Have a load test done on the battery.. If ok check the wiring circuit as the alternators require battery voltage before they will charge (no residual magnetism in an alternator)
while the battery has been charged, check for a voltage of 12- 12.5 volts,, then start the vehicle,, you should get a reading of 13.75- 14.5 volts , which would show the alternator and voltage regulator of functioning properly if not,, charge the battery and replace the alternator
FIRST, YOU MAKE SURE THE BATTERY IS FULLY CHARGED.. A GOOD BATTERY WILL GO FOR 12 HOURS EVEN IF THE ALTERNATOR IS NOT WORKING.. SECOND YOU TURN THE CAR ON.. ONCE THE CAR IS ON. YOU DISCONECT THE BATTERY,, IF THE ALTERNATOR IS GOOD , THE CAR SHOULD REMAIN ON WITHOUT A BATTERY.. IF IT SHUTS DOWN , YOU HAVE A BAD ALTERNATOR OR THE WIRING IS WRONG ONE OF THE TWO.. SHORTS ON YOUR WIRING CAN CAUSE THE BATTERY TO LOOSE POWER.. BUT NOT THAT FAST. BECAUSE IF THE SHORT WAS TO SERIOUS.. YOUR WIRING WOULD BE BURNED.. COMPLETELY.. IF THE ALTERNATOR IS OKAY,, REPLACE YOUR BATTERY,, MOST OF THE TIME BATTERIES GO BAD EASY WITH ANY LITTLE PROBLEM THE CELLS BURNOUT AND THEY DONT HOLD A CHARGE EVEN IF FULLY CHARGED THEY WILL LOOSE POWER IMMEDIATELY .. I THINK THAT IS YOUR PROBLEM.. SINCE IT ONLY LASTED LIKE 20 MINUTES.
well...whenever the battery light comes on in a vehicle its almost always a charging problem,i would suggest replacing the alternator and charging the battery before starting it,alternators were meant to keep a battery charged NOT charge a battery, hope this helps