The GDT-11 is a type of multimeter or voltage tester that is manufactured by Gardner Bender. This is a tool that is used to determine the voltage of an electrical current. This includes determining the voltage of your car's battery and the voltage of the electrical current at an electrical socket. If proper voltage is not being detected, then corrective action will be necessary to fix the issue.
Turn on the GR-11 by moving the range selector switch to the type of voltage that you want to test. You can choose "DC" by turning the switch to the right and "AC" by turning the switch to the right.
Open the bonnet of your vehicle and set the support bar. Find the location of the battery inside the engine compartment.
Turn the switch to "DC" to test the voltage of your car battery.
Place the tip of the black coloured probe on the negative battery terminal. Place the tip of the red coloured probe on the positive terminal.
View the voltage of the battery on the display.
Turn the switch to "AC" to test the voltage of an electrical socket in your home.
Insert the tip of the red coloured probe into the small slot of the outlet. Insert the tip of the black coloured probe into the larger slot.
View the voltage of the outlet on the display.