What could be wrong if the battery light stays on and still runs down a 1994 Mitsubishi Mighty Max after installing new alternator?

There could be a number of reasons why the battery light stays on and the battery still runs down in a 1994 Mitsubishi Mighty Max after installing a new alternator. Some possibilities include:

* The alternator is not getting enough power. Check the connections between the alternator and the battery and make sure they are clean and tight. Also, check the wiring harness for any damage or corrosion.

* The battery is not holding a charge. Have the battery tested to make sure it is able to hold a charge.

* There is a short in the electrical system. This can be a difficult problem to diagnose, but you can start by looking for any signs of damage or wear in the wiring harness.

* The voltage regulator is not working properly. The voltage regulator controls the amount of voltage that is sent to the battery from the alternator. If the voltage regulator is not working properly, it can cause the battery to overcharge or undercharge.

If you are not able to diagnose and fix the problem yourself, you should take your vehicle to a qualified mechanic.