How To Read A Car Battery Tester. If youre getting a reading with a minus in front of it -126 rather than 126 youve got the probes the wrong way round. Touch the red probe to the positive terminal and the black probe to the negative terminal.
Hook the multimeter to the battery terminals. If you dont have a multimeter to tell you the voltage of your battery you can do a test of your electrical system by starting the car and turning on the headlights. Part 1 of 2.
Touch the red probe to the positive terminal and the black probe to the negative terminal.
In the test apply a load equal to one half of the cold cranking amperes CCA rating of the battery for 15 seconds. In the test apply a load equal to one half of the cold cranking amperes CCA rating of the battery for 15 seconds. Hold the red probe to the positive terminal and the black probe to the negative terminal. Place the black lead on the negative terminal.
