no spark at coil
08-03-2018, 06:24 PM
#1
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no spark at coil
65 327. voltages correct to coil , ground at ground, and 12v at 12 v, tried three different coils and still have no spark to ground when i spin motor, any body have any ideas ,what to check next my brother in law has same problem, wireing harness is new, coil wire is new. im lost and so is he.
08-03-2018, 09:22 PM
#2
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65 327. voltages correct to coil , ground at ground, and 12v at 12 v, tried three different coils and still have no spark to ground when i spin motor, any body have any ideas ,what to check next my brother in law has same problem, wireing harness is new, coil wire is new. im lost and so is he.
08-04-2018, 07:49 AM
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What kind of distributor are you running? If points check that they are opening and closing. If you have electronic make sure that reluctor ring is spinning and connections to pick-up are connected and have proper voltage. If you are running the TI distributor and box you will have to trouble shoot the system.
08-04-2018, 08:05 AM
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Check the point gap and/or run a file through them to knock the crud off.
You can verify the points are making/breaking the coil circuit by putting a test light on the minus side of the engine and spin it over. If you get a bright on/off/on/off flashing light, your points are good. It you don't...................................
08-04-2018, 01:45 PM
#6
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65 327. voltages correct to coil , ground at ground, and 12v at 12 v, tried three different coils and still have no spark to ground when i spin motor, any body have any ideas ,what to check next my brother in law has same problem, wireing harness is new, coil wire is new. im lost and so is he.
08-04-2018, 04:06 PM
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I remain amazed at the number of people that don't understand what a simple test light will tell you in about one minute..
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08-04-2018, 06:11 PM
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Mike the art of diagnosing and troubleshooting is slowing dying in this throw away society. Without a scan tool telling them what to replace people are lost
08-04-2018, 06:14 PM
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Do what Mike said. If the points don't 'make and break', you will have zero coil output. Not the coil's fault.
08-04-2018, 08:31 PM
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08-05-2018, 09:45 PM
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08-06-2018, 02:33 PM
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don't flame me i know how to use meter, probe and timeing light.
latest tests this morning;
i had wire for 12V choke wired to back side of distributor and thought that might be problem so took that loose no difference.
checked points They are set at .015 when open so they do open. checked 12v on coil, and drops to 17.5 with key on and has 11.5 volts when cranking.
im working alone car spins fine and have plenty of gas no effort to start what so ever so i guess still no spark. i have read the article and it confuses me because i can see no reason for my failure everything seems to be as it should be.
latest tests this morning;
i had wire for 12V choke wired to back side of distributor and thought that might be problem so took that loose no difference.
checked points They are set at .015 when open so they do open. checked 12v on coil, and drops to 17.5 with key on and has 11.5 volts when cranking.
im working alone car spins fine and have plenty of gas no effort to start what so ever so i guess still no spark. i have read the article and it confuses me because i can see no reason for my failure everything seems to be as it should be.
08-06-2018, 02:57 PM
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I'm still amazed!
08-06-2018, 03:04 PM
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08-06-2018, 03:43 PM
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08-06-2018, 03:50 PM
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He still hasn't checked to see if he has spark at the points, or a dwell reading on a dwellmeter. That's the first thing to check.. The 12v on the coil DROPPING to 17.5 volts with key on is very, very strange.
08-06-2018, 04:09 PM
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08-06-2018, 04:18 PM
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08-06-2018, 04:27 PM
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I think you're going to take this as "flaming you", but you don't seem to be reading the replies correctly. First off 12 doesn't "drop" to 17.5. Be more careful in your answers, Incorrect facts will do nothing but make the right answers harder. Second, you say "plenty of fuel". Do you mean in the tank. If so, that means nothing to the engine, it has to get to the carburetor. When you move the throttle, do you see gas squirt into the carb? Third, you say "assume" no spark. Verify that first. If you don't have spark, you don't need to be working on fuel, etc. Go one at a time. All it takes is air, fuel, and spark at the right time to run. See which one is missing. Since you know how to use a test light and are unwilling to connect it to the connector on the coil for the small wire that goes over to the distributor for the points plate and then crank and see if it flashes, do it this way. You can get some help, have them crank the car over while you pull the coil wire or a spark plug wire and hold them near the engine block. Hold by the rubber, wear some gloves if you need to. You should have a good healthy spark while the engine is cranking. Fourth, you should not have a wire connected to the distributor or coil for an electric choke. My suggestion (which in no way means you can't do it yourself) is to ask someone with some old car ignition experience to watch while you try stuff and give advice, or to fix it for you and you watch and learn the method to systematically eliminate possible problems.