User Manual

Safety Precautions
1
Always observe safety precautions whenever working on a vehicle.
DO NOT wear loose clothing, watches, rings or other jewelry when working on a vehicle.
Always wear safety eye protection.
Only work on a vehicle in a well-ventilated area.
Put transmission in “park” (for automatic) or “neutral” (for manual). Set parking brake. Put
blocks on drive wheels.
Avoid moving fan blades or any potentially moving parts. WHEN USING THE TIMING
LIGHT, THESE PARTS MAY APPEAR TO BE STOPPED OR MOVING SLOWLY.
Avoid hot engine parts.
The vehicle battery produces explosive gases. DO NOT smoke or allow spark or flame
near the battery.
BE CAREFUL when working near high-voltage parts (spark plugs or coil terminals).
Turn off ignition before connecting (or disconnecting) any testing equipment.
ALWAYS READ THE VEHICLE'S SERVICE MANUAL BEFORE PERFORMING ANY
PROCEDURE. OBSERVE ALL SAFETY PRECAUTIONS.
NOTE
EMI/RFI problems with Digital Timing Lights:
If the Digital Timing Light readout becomes inoperative or locks up during use,
disconnect and reconnect the timing light's positive battery clip from the battery to
reset the unit.
Some aftermarket ignition systems and/or specialty spark plug wires (solid core
wires, racing wires, off-road wires) radiate above normal Electro-Magnetic
Interference (EMI) and Radio Frequency Interference (RFI) which can cause
improper operation of testing equipment. Please contact these manufacturers for
instructions on how to use an inductive pickup with their systems.
It may be necessary to replace the No. 1 spark plug wire with an O. E.-style plug wire
during testing.

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