Removing alternator

I've posted charging system's wiring schematic below, let me know if you need further assistance..

1. Disconnect the battery. For additional information, refer to BATTERY, MOUNTING AND CABLES.

2. Remove the upper generator nut.

3. Remove the generator heat shield top nut.

4. Raise and support the vehicle. For additional information, refer to JACKING AND LIFTING.

5. Remove the screws and the accessory drive splash shield.

6. Release the accessory drive belt tension and remove the belt from the generator pulley.

7. Remove the generator heat shield lower nut and the heat shield.

8. Release the two air intake tube retainers and remove the air intake tube assembly.

Try these procedures below, also disconnect the right motor mount at the right strut tower to allow extra motor movement, then pull the engine forward enough to allow room to remove the alternator from the top.

The symptom suggests a defective diode inside the generator. In the case of my minivan, I've been driving it like that for over a year. To determine if that is the problem, a load test must be performed with a tester that can measure "ripple". With one bad diode, the ripple will be very high and the most output current you'll be able to get will be very near one third of the unit's rated capacity. A 90 amp generator will only produce 30 amps which is barely enough to run the fuel pump, injectors, ignition system, lights, and radio with little left over to recharge the battery.

If you measure battery voltage while the engine is running, you'll find it's a little on the high side. Normal is between 13.75 and 14.75 volts. The voltage regulator sees the dip in voltage during the period when the defective diode should be passing some output current. It responds to that dip by increasing generator output voltage to try to get the current back up, then it doesn't cut back quick enough when the good diodes are conducting. That's why you might find from 15.0 to 15.5 volts at the battery even though the output current is low.

Check for codes first, my concern is that they may have flashed the electrical system and done some damage, there should be no reason for this issue if the battery was disconnected and the alternator fitted as per normal operations.