How To Check Alternator Amps. If everything appears fine the alternator should be removed and bench tested which can be done for free at AutoZone. If you see higher readings chances are the alternator is good.
Let the engine idle at around 1200 rpm. Open the cars. For AC VOLTS connect the other end to ground such as an engine bolt or cylinder fin.
Testing an AlternatorIf the alternator is working well your multimeter should read somewhere in the vicinity of 14 volts typically 138-142.
You will need something to read the voltageamperage of your battery and alternator. And can measure it. Wear protective gloves as you need to be in close contact to the car battery to check the ampere output from. Another simple test is to check your interior lights.
