A logic probe is a hand held pen circuit tester its is good for testing +/- ECU signals and injector pulses.
How it works
The one we build can only test volts less that 24 volts.For our logic probe to work connect the red to positive and black to negative. Both green and red led should light up,this shows that the logic probe is working and is connected correctly. With the brass tip touch the positive of the battery now the green LED should go out and the red LED gets brighter. If you touch the probe to the earth(negative) the red LED should go out and the green LED gets brighter.
How it works
The one we build can only test volts less that 24 volts.For our logic probe to work connect the red to positive and black to negative. Both green and red led should light up,this shows that the logic probe is working and is connected correctly. With the brass tip touch the positive of the battery now the green LED should go out and the red LED gets brighter. If you touch the probe to the earth(negative) the red LED should go out and the green LED gets brighter.
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