How To Test Alternator Amp Output. Remove battery terminals and make sure these are 100 clean from and buildup of corrosion. You can purchase an electronic alternator amperage tester for your shop use a clamp-on ammeter.
How To Test An Alternator. Bring the vehicle to a fast idle of around 2000 rpm and turn on accessories like the headlights and AC blower motor. Thus its important to ensure that the alternator the main part of the the charging system of the vehicle is producing enough voltage to maintain the battery.
Alternator Ratings The term high-output for alternators simply means the new rebuilt or rewound unit is capable of producing more amps across the board than a stock unit.
If the reading is more than 15 percent below the maximum check youve turned on as many item as possible. Load system voltage with carbon pile to get maximum amp output 4. Wear protective gloves as you need to be in close contact to the car battery to check the ampere output from your alternator. Test the battery voltage at rest this should read between 125 and 128V on average.
