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operating instructions and Parts manual
ACtivAte tHe ComPonents WitH neGAtive
voLtAGe onLy
Apart from applying positive voltage, the technicians
can also use this unit to provide ground to the
components. These procedures are as follows:
1. Contact the tip to the negative pole of the
component; at this stage, the red LED should be
on if the component is working correctly.
2. Push the polarity switch backward and release it
quickly. If the LED goes from red to green, you may
proceed with further testing. If the green LED goes
off or the circuit breaker of the short circuit protec-
tion is tripped, it means it has overloaded. This may
be caused by the following reasons:
• The component is short circuited or it has
been connected to the ground/ negative
pole directly.
• The component is a high current component.
If the circuit breaker of the short circuit protection has
tripped, it will reset within 60 seconds.
imPortAnt
Please operate this function using a schematic and
correct testing procedures because applying voltage
arbitrarily may cause damage to components.
Auto CirCuit tester
trAiLer LiGHt test
To test trailer light wiring, you need to follow this
procedure:
1. Connect the ground test lead to trailer ground.
2. Probe the tip to the outlet of the trailer; push the
polarity switch forward, then technician can diag-
nose the function of the trailer light.
voLtAGe test
The technician can also use this unit to assist with
ground test lead to test the voltage of the circuit.
However, during the voltage test, do not push the
polarity switch.
1 If probe tip is floating (not contacting a circuit),
the red and green LED turn off.
2． If you probe the tip to a positive circuit, the red
positive sign"+" LED will light and the voltmeter
displays the voltage reading within 1/10th of a volt.
3． If you contact the probe tip to a negative circuit,
the green negative sign"-" LED will light.
LoCAte misFirinG CyLinders
By placing its probe tip next to a spark plug wire or coil
(DON'T pierce it directly), through capacitive coupling,
it can sense the high-tension ignition pulses and at the
same time display a voltage reading.
Warning: do not ContACt ProBe tiP direCtLy
to tHe seCondAry iGnition CirCuit.
Properly test each plug wire or coil to help locate
cylinder misfires.
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