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operating instructions and Parts manual
mode instruCtion
The unit has four modes, the four modes can be
selected by depressing the mode select button and
cycling through each one.
MODE Display
Voltage Meter
Measuring range:
0v~60v DC
Locate missing
cylinders
Measuring
frequency
of the
ignition pulses
Peak Detection
Power Connection
1. Hook up the black power clip to the negative of the
vehicle battery.
2. Hook up the red power clip to the positive of the
vehicle battery.
GreatNeck Tools, LLC
Mineola, NY 11501
Made in China
Auto CirCuit tester
seLF-test
If the unit is working correctly, the conditions should
be as follows:
• The red LED should be on when the technician
pushes the polarity switch forward (toward the posi-
tive side).
• The green LED should be on when the technician
pushes the polarity switch backward. (toward the
negative side).
the sign"Hc"
denotes "Hz"
Polarity test
• If the tip is in contact with the positive pole, the red
LED will be on.
• If the tip is in contact with the negative pole, the
green LED will be on.
• If the tip is in contact with an open circuit, neither
LED will be on.
Red LED lighting = positive
4
24366
Green LED lighting = negative
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