<b>12V 24V Battery Alternator Tester for Trucks SUVs Cars Motorcycles</b> <br> <br> Whether your battery is 12V or 24V, this car battery & alternator tester delivers precise analysis of charge and status levels. Testing the battery is simple: with the engine turned off, connect the RED battery clamp of the tester to the positive battery terminal and the BLACK battery clamp to the negative battery terminal and the battery state will display followed by the state of charge. <br> <br><b>Battery Mate Functions:</b> <br>Alternator state check, battery state check, check before charge and overload display.<br> Checking the charging level<br> Functional test of the dynamo<br> Checking the battery starting capability<br> Battery overload display