typically when you replace your alternator you either replace your battery or completely remove it from the vehicle and charge it so that it is fully charged. The battery loses power when the alternator is too weak to recharge it. You might not have enough voltage going through your engine. try this. answer if it is only coming on at 3,000 rpms, I would suggest you look at your serpentine belt and make suer it is not slipping on the alternator pulley. Your idler pulley spring may be weak and is not keeping the belt tight on the alternator. If you bought the alternator from Pep Boys or AutoZOne I would suggest taking it back and having them test it. I haeve already purchased parts from them, realizing they are rebuilt and not new and have found some defective. I replaced a starter 3 times and had to go to another store to find a good one when I asked Autozone to test them before I took it out of the store. They had a whole batch of bad starters..........just something to think about. If your alternator is brand new, not rebuilt, then one of the diodes inside may be going bad.
I have a 1997 ford expedition that the alternator is not charging the battery. Had the alternator tested and it was good the battery is new. Cant find the fuse for the alternator does anyone know where it is?
did you unhook the battery before replacing the alternator
my battery is still on after changing battery and altnator
You might have a bad battery, a poor connection between the battery and alternator, or a bad ground from the battery.
The alternator is probably bad. That is what recharges your battery
Alternator is defective and needs replacing.
Its the alternator, it is not charging the battery. Happened to me recently.
Check battery connections, check alternator out put. Exc.
Battery may have a dead cell and need replacing.
The vehicle should ave a voltage regulator. If the battery and alternator are good then the regulator is most likely bad.
With the car or truck running disconnect only the positive side of the battery ... if it stays running that means the alternator is good if it dies then it needs replacing
You need to replaced the starter or the alternator.
If the light is still on then the problem was not the battery but was instead the alternator which is more than likely defective.
If the alternator is not producing 13.5 to 15.5 volts it is defective and needs replacing.
alternator or bad wires
Clean both battery cables and check the connections on the alternator. If it continues, go to auto zone and have the alternator checked.
It may need replacing or it can be the alternator is overcharging the battery. Have the charging system checked out. The alternator should output from 13.5 to 15.5 volts with the engine running at idle.
Start replacing the 2000 s10 alternator by disconnecting the battery. Remove the air inlet hose, and the serpentine belt. Take off the bracket over the alternator if it has one. Unbolt the alternator and disconnect the wires. Reverse the procedure to install the new alternator.
more than the alternator diode is bad have the alternator checked
It could be the alternator or an electrical issue
did you check your battery and alternator?
Maybe your alternator needs replacing.
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.
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.