Quick, easy method of testing batteries & alternators. LED display indicates battery / alternator condition. Magnetic back. Specification: For use with 12V DC only.
Car battery with 2 terminals (+) positive & (-) negative
To check " Battery" or " Alternator" are the same procedure. just connect the "Black clip" on (-) negative and, touch the :RED PROBE" on (+) Positive.
There is a "Magnetic Board" on the back side of the :Voltage Checker". I could help you to fix your "Voltage Checker" on suitable metal-sheet place of car easily
Before Checking please, clean your car battery terminals & Adjust relative belts. which will help you to find the real situation of "Battery" & "Alternator"
Battery Check (Engine Stop):
If the battery has just been used, Turn on the major lights for 2 minutes. then to turn off & waiting for 1 minute before checking the battery. in order to get a correct reading
If the battery is in good condition that the #1, #2 & #3 LED light will be lighting. Otherwise you need to maintain you car battery
Alternator Check (Keep Engine Running):
Normally make the engine turn at 2000 R.P.M
If the alternator is in good condition. 6 LED lights will be lighting. Otherwise the facilities & system that mentioned above need to maintain