Which Battery Cable To Disconnect To Check Alternator. If your vehicle wont start its usually caused by a dying or dead battery loose or corroded connection cables a bad alternator or an issue with the starter. So how to test alternator by disconnecting battery.
The first test can be done at your garage. Testing the Alternator by Disconnecting Battery. If the vehicle keeps running the alternator is working.
The second you disconnect the battery the voltage regulator pegs the alternator to put out maximum power.
While your car is running disconnect the positive battery cable. Fortunately its a short and easy process. The removal of a cable with the engine running cuases a voltage spike that can damage the computer system on the car. Heres a simple test to see if you Alternator is charging if your car is wired correctly.
