bulleyboy99 Posted May 28, 2013 Posted May 28, 2013 hey, i have been overseas and my L28 has been in storage. The engine turns over and the distributor is spinning and theres power to the coil. Yet theres no power coming from the distributor to the spark plugs. i have changed the distributor cap and the rotor arm. i have 8volts coming out of the coil but still nothing at the spark. any ideas?? Quote
Six_Shooter Posted May 29, 2013 Posted May 29, 2013 You should have several thousand volts coming out of the coil. Do you mean you have 8 volts being fed to the coil? Is this a points ignition with a resistor? If so what is the voltage before the resistor? Quote
bulleyboy99 Posted June 2, 2013 Author Posted June 2, 2013 i have actually 7v coming from the coil lead to the distributor. its points and not electronic... Quote
d3c0y Posted June 2, 2013 Posted June 2, 2013 What about the coil itself? That would be an easy place to start? Do you still run a balast resistor too? Quote
Six_Shooter Posted June 2, 2013 Posted June 2, 2013 i have actually 7v coming from the coil lead to the distributor. its points and not electronic... If you have 7 Volts on the high tension lead between the coil and the distributor cap, the engine will never run. The ignition system requires several thousand volts for the spark to jump the gap, points or electronic. You tested this while the engine was cranking, or static? I would never suggest testing while cranking, but if that is what you're doing and only getting 7 volts that would be a large portion of your issue. If there is this 7 volts at the coil output while the engine is static, that tells you ziltch. The Ignition spark is only produced in shirt bursts while the engine is running or cranking. Best way to test coil output is to use either e proper tester or a spark plug with the threded end attached to ground, either laying on the engine somewhere or a good sized jumper lead clamped to it. Then crank the engine over looking for a blue spark. If the spark is orange, the spark is weak. Quote
be-zed Posted June 2, 2013 Posted June 2, 2013 As you have a points dizzy ,you might want to check the condenser (small cylinder thing with a wire out one end and bolted to the dizzy). They don't last for ever and when they fail there will be no spark. Quote
bulleyboy99 Posted June 8, 2013 Author Posted June 8, 2013 good points guys, well i bought a new coil today and will be getting a new condenser. so but enough power according to my manual to go to. hopefully if i change those things it should getup and running in no time. ill keep u all informed! =) Quote
bulleyboy99 Posted June 10, 2013 Author Posted June 10, 2013 So I replaced the coil and condensor and I'm getting 12 volts through the coil when I turn the ignition on. But when cranked it still doesn't change to high voltage. Any suggestions? Quote
Six_Shooter Posted June 10, 2013 Posted June 10, 2013 Pull the coil wire off the dizzy cap, place it near a ground, the engine block, intake manifold, etc, or better yet use a spark tester or spare spark plug that is grounded in a similar manner and using a piece of wire quickly ground and then remove the negative coil terminal. There should be a spark when you remove the ground from the negative terminal. If there isn't then you have a coil problem, if there is, there is a triggering (points) problem. Quote
Moderators Zedman240® Posted June 10, 2013 Moderators Posted June 10, 2013 How are you measuring the voltage out of the coil? I hope you're not sticking a probe down the center high tension plug of the coil..... A coil while cranking should have 12V on the smaller spade terminal connection and around 9V while running. Quote
Six_Shooter Posted June 10, 2013 Posted June 10, 2013 How are you measuring the voltage out of the coil? I hope you're not sticking a probe down the center high tension plug of the coil..... A coil while cranking should have 12V on the smaller spade terminal connection and around 9V while running. That's what it sounds like to me, and not sure why he's trying to test that way. The coil discharge will be several thousand volts at the point of creating spark. Quote
bulleyboy99 Posted June 12, 2013 Author Posted June 12, 2013 so by proving that theres no high tension i decided to test the coil by putting volt meter into the coil. In which 12 volts came out when the ignition is turned. and no high tension is produced. ive tried ur method six but theres not enough voltage coming out of the coil. its like the coil doesnt exist and the current just flows.!! Quote
Six_Shooter Posted June 12, 2013 Posted June 12, 2013 Measuring the coil output with a DMM tells you nearly nothing in this case. Disconnect all wires to the coil, use a jumper lead to provide 12V to it, you can connect directly to the battery for this test, then do as before quickly rapidly ground the negative terminal and watch for a spark being produced at the coil wire end/spark plug grounded to the engine. Quote
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