THE ALTERNATOR IS NOT CHARGING THE BATTERY WHAT IS THE SOLUTION

Battery Drains Out While Driving: Had Alternator Checked and I ... (2carpros.com)
Above link has wiring diagram for 98 also examples of problems with battery not charging
below link found two fixes for battery not charging 97
Alternator Not Charging: Electrical Problem 4 Cyl Two Wheel Drive ... (2carpros.com)

Below link found battery ground to frame corroded
Alternator Charging Issues - Nissanhelp.com Forums

Replacing the battery fuse on a Nissan Frontier. - YouTube

Charging Problem - Battery Not Charging but Alternator OK! - Nissan Forum ' Nissan Forums (nicoclub.com)

check the wiring on the vehicle to and from the alternator. Usually, the alternator needs excite voltage or it won't charge. Also, There is a circuit from alternator to battery, if something wrong with that circuit, the battery won't be charged even though the alternator is working fine.

What is model year? I don't know if your alternator is computer controlled?

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)

Check for fuse and or give it a direct ground from the battery terminal and see what happens it should charge 14+V

The battery most likely has dead cells and not charging due to the alternator .The alternator is doing what it should, your battery just can't hold the charge the alternator is putting out. Go have the battery tested at a local auto zone or advance auto store. Free to check

this is caused by a failing alternator. Kragen auto and Autozone tests these for free.

ALTERNATOR DRIVE BELT SLIPPING OR BATTERY CABLES NEED REPLACING IF THEY ARE THE ORIGINAL ONES.THE VOLT GAUGE COULD BE FAULTY.TO TELL GET A DIGITAL VOLTMETER HOOK TO CAR BATTERY CRANK CAR UP.BATTERY VOLTAGE SHOULD BE 13.5 TO 14.5 VOLTS. WITH NEW CABLES. IF NOT CHECK ALTERNATOR FIELD WIRES FOR DAMAGE ALSO ALTERNATOR POSITIVE WIRE FOR DAMAGE.

Alternator is what charges the battery. The alternator isn't putting out enough of amps to charge your battery and you will get a light or gauge reading that the voltage is low.

A working alternator can try to charge a bad battery but won't. Have the battery and charging system checked with a machine. Also note: your alternator is not designed to charge a battery. It is made to maintain the state of charge present in the battery. If the battery has been drained, then jumped, the alternator can put a surface charge there but will never fully charge the battery...This is only done with an external battery charger. Not doing this will over-work the alternator and shorten battery life!

The instructions for installing a new alternator usually read to fully charge the battery (12.3 - 12.8 volt range). Otherwise, the alternator will be damaged when it initializes. I have seen some extreme damage result from installing a new alternator with a low-charge battery. The torque required to turn an alternator when damaged in this scenario is unbelieveable!