How To Check Your Alternator By Removing Battery Cable. A parasitic battery drain is barely something that systematically and continually drains your battery. Remove the negative battery cable with the engine running.
Disconnect the positive terminal of the car battery while it is still running. If disconnecting the battery interferes with the voltage regulators control voltage input its possible for the alternator voltage to go way over the top Ive heard some say. Dont test an alternator by disconnecting the negative battery cable.
Keep in mind that jumping batteries greatly increases the chance that a voltage.
While it is running carefully remove one of the 12V battery leads. A friend explained that the following is a simple way to test an alternator to see if it is working. Yes you read that correctly. No need for HazMat suits so far.
