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An advance timing light has a dial on the back of it so that you can set it to the correct timing setting, I.E. 4 degrees before TDC. If your timing index on the motor is unreadable due to rust or is just missing, this still allows you to set the timing.

Hook the red lead to the positive battery cable and the black lead to a ground. Determine which cylinder is your #1 cylinder and then clip the inductive coil clip around that wire. Loosen the hold down bolt on your distributor so that you can turn the distributor , with some effort, and start the motor and pull the trigger. The light will tell you when it is at the correct setting. tighten the hold down bolt and re-check as the distributor can move sometimes when tightening the hold down bolt.

Always either pull the vacuum line and plug it or unplug the electronic timing advance wire ( which ever your vehicle has) BEFORE trying to set the timing. Reconnect after setting the timing.

There should be a label under the hood that will describe what the wire looks like and where it is located.

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Q: What is a advance timing light and how does it work?
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