It reads the amps that the alternator is putting back in the battery.
check battery and alternator
The inverter isn't run off the alternator... it's run off the battery. The alternator simply recharges the battery.
Engine is idling too slow or the alternator is weak. Or battery is getting tired.
"Big" Battery Damage Alternator?No, it should not damage the alternator. If this has happened it's probable that the problem is somewhere in the wiring circuit connected to the battery and alternator.
It depends on the load and the voltage. In an automobile, a battery will typically have a voltage of about 12 Volts. If the engine is not running and you turn on the lights, the lights will start drawing current from the battery and the voltage will drop by a volt or so, depending on how strong a charge the battery has. An alternator will produce in the neighborhood of 15 Volts. If it is trying to push current into a system with a fully charged battery, it will only be able to push a few amps. If the voltage in the battery drops, the alternator will be able to push more amps. A completely dead battery will draw the most current (amps).
Either the battery is bad or the alternator is bad.
That's not 12 amps,that's 12 volts,which means the system isn't charging Measure the voltage across the battery terminals,if its charging properly,it will be between 13.8 and 14.7 volts,anything less and its not charging. Suspect then a faulty alternator or wiring problem. and have the battery properly recharged and tested too,a low battery will not give you a correct charging reading and a faulty alternator can take its toll on a battery.
Your radio and fan may have shoted out or the wrong amps are being used. If there isn't enough amps to run everything. The battery might not have enough juice, or there are wires touching somewhere.
A 58 Amp Heavy Duty Battery 540 Cold Cranking Amps @ 0° F (Primary): Maximum Alternator Capacity (amps): 115 Amps
Your alternator may not be putting out enough Amps to charge your battery and run your headlights as well. You can test this by measuring the voltage from the battery with a multimeter. With the car running the volts should be around 14 or more on a 12 volt battery. Try it with the lights on too.
hi in 94 corolla 80 amps alternator