Re: Please help

Posted by KEB on April 02, 2006 at 20:30:47 from (207.94.26.1):

In Reply to: Please help posted by rrs26ja on April 02, 2006 at 16:59:27:

Connect a test light between the side of the coild connected to the points & a good ground. The light should be lit when the points are open (connected to battery through the coil) and off (shorted to ground) when the points are closed. The light should pulse in time with the points when you crank the engine.

You can also use an analog voltmeter if you don't have a test light. Don't use a digital voltmeter for a test like this, the integration time is too long to see individual pulses.

Hard to tell from your description if you may have something in the points wired wrong, but if they aren't opening & closing properly you won't have spark.

The moveable arm on the points is connected to a screw terminal mounted on insulating material. The copper band is probably the connection between the moveable arm and the terminal. The low side of the coil and the condensor are both electrically connected to the moveable arm. When the points close, the low side of the coil is grounded via the fixed contact.

The top of the coil will be at battery voltage, unless you have a ballast resistor, in which case the top of the coil should be at about 1/2 battery votage when the points are closed (current being drawn through resistor) and battery voltage when the points are open (meter won't draw enough current to cause a voltage drop through the resistor) 8+ volts seems a little low, but may just be the battery voltage when its cranking.

Keith

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