You should check the starter and alternator.
Alternator is weak and needs replacing. Drive belt on alternator can also be slipping due to being loose. Check the alternator output at the battery with the engine running. It should read from 13.5-16 volts DC. Any less and it needs replacing.
Is the battery dead? Check for 12v on the main alternator cable. If no power, check for burned out fusible links between alternator and battery. You may need a wiring diagram to check further.
check your alternator belt,and your pulleys ,
did you check your battery and alternator?
The charging warning light should automatically reset if the battery is disconnected. Check the battery cables and ensure they are properly connected. Also check the alternator connections. If the light is still on there may be a problem with the new alternator.
You can find a 97 Nissan Altima alternator schematic diagram in the vehicle's owner's manual. You can also check local auto part stores.
You possibly have a loose alternator belt or the alternator is weak. Check the voltage at the battery with the engine running. It should be 13.5 ? 16 volts. Any less and the alternator is weak and needs replacing. Also make sure the connections at the battery are clean and tight.
Get your alternator tested at autozone,its free,and check your battery too.
Check to see if any wire connectors came loose to the alternator ground or leads, Check to see if you have correct tension on your belt.
The battery light is for low alternator output voltage. Try testing the alternator output using a miltimeter and if its less than 13 volts your alternator isn't putting out what it should. If it has low output check the belt tension and all wire connections before replacing alternator
check your thermostat to see if its opening.
Check alternator,check air filter,check fuel cut off switch.
usualy if the alternator is not defective then its the battery. you should start by cleaning the battery post. then you could check the terminal wire that runs from the battery post to the alternator. if thats not it you should check the ground on the alternator.
I don't own a 1993 Nissan Pickup Truck, stupid! check your thermostat to see if it opening
check your local autoparts for a Chilton's or Haynes repair manual.
Prices are between and around, $120 - $170. Check out the Web Links for more information.This is for a rebuilt alternator. New ones can cost over $300. I got an estimate of $600 from a dealership. Replacing the alternator should take 2 - 3 hours @ $70 per hour. Best case scenario you'll spend $300 for a rebuilt alternator and the labor.
Check the battery direct with a volt meter, while running. Should have around 14 volts. Less than 13, then might have to replace the alt.
Need to check if it getting power, if it is... the mirror needs replacing.
Check your coolant levels, and check your thermostat - it may need replacing. Also check your heater hoses to ensure they're not leaking.
Defective voltage regulator. Check the voltage at the battery with the engine running with a digital volt meter. You should get 13.5 to 15.5 volts. Any more and the alternator is overcharging and needs replacing because in almost all cases the regulator is built into the alternator.
Check for any lose connections, wires, exc.
You should check the battery,transmission, and maybe the engine
There are times when the alternator will test out fine as far as amp output and voltage output but if your alternator has a weak diode(s) it may trigger the light to go on. I hate to say you should replace the alternator, but your charging system is pretty much self contained in your alternator so I believe the problem is in fact in your alternator. Good luck.