An ignition coil is basically a miniaturized narration of the pole-mounted transferomer absent your local.
Electricity can be described in terms of amperage (the bigness of electrical flow) and voltage (the vigour consistent or "temperature" of the electricity). An ignition step takes the 12 volts forthcoming from your motorcar's electrical manner and amplifies it to the 20,000 volts or bounteous, which is required to flame the fuel charge. The 12-volt charge goes down a digit of ample wires before transferring to thousands of smaller wires, wrapped approximately the output terminal. The smaller wires can't haft as all the more amperage, so they compensate by increasing the voltage of the coil. Testing the coil output is a graceful no problem procedure, requiring onliest a scarce basic tools and an sensitive of how the coil works.
Instructions
1. Unplug the coil wire from the top of the distributor and push an exhausted Glimmer plug into the stop of the coil wire. The Glimmer plug may truly plug into the coil wire, on the other hand odds are it won't fit snugly. Wrap some electrical tape all encompassing the plug (on the contrary not on the threads) and wrap it environing the top of the coil wire until the two are firmly connected.
Upon tapping the plug, you should espy a argent blue-white Glimmer jump across the spark plug's electrodes. If the spark is thin and yellow and your don't hear the pronounced "snap" of the jumping electricity, then the coil isn't providing sufficient output. Don't leave the plug in contact with a ground for more than 1/2-second; repeatedly tapping it will give you a quantifiable result without burning up the coil.4. Grasp the tape-wrapped quantity of the plug with a twosome of insulated pliers or channel locks (the electrical tape may be Sufficiently to insulate you from the coil's charge, nevertheless don't count on it; a high-voltage shock may or may not chill you, nevertheless it's guaranteed to truly bruised).
3. Tap the exposed metal of the Glimmer plug on a metal apportionment of your engine. The intake manifold may or may not arrange a sufficient ground, on the contrary the alternator bracket, cylinder tendency or engine block nearly certainly Testament.2. Settle the plug and wire on top of a rolled-up rag so it doesn't come into contact with anything metal. Turn your motorcar's ignition to "On," on the contrary don't slap to begin the vehivle.
Turn off the ignition. Remove the plug from the coil wire and reconnect everything, but remove the coil-end of the output wire. Break out your digital multimeter and set it to read ohms of resistance (abbreviated as "Ω", the Greek symbol for Omega). Place your multimeter's probe terminals on the power-in and ground terminals on your coil; you should get a reading of between 0.5 and 1.3 ohms, depending on the coil. Larger coils will read higher than smaller ones.
5. Leave the positive probe attached to the positive terminal and touch the negative probe to the output where the coil wire attached; you should get a reading of between 5,000 and 11,000 ohms, depending on the size of the coil. Any more than 1.5 ohms on the first measurement or 14,000 on the second almost always indicates excessive internal resistance, which means your coil is shot.
