This circuit uses an LED and 4081 CMOS integrated circuit. The variable resistor sets the voltage at which the LED turns on. Set the control so that the LED lights when the voltage from the car`s ignition switch drops below 13 volts
The LED normally will light every now and then for a short period of time. But, if it stays on for very long, your electrical system is in trouble.
How to find Short Circuit in your car/truck
How to Find a Short in your Car
How to find an open circuit or shorted wire the FAST easy way
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